Display voltage/frequency of a input device beginner question

Hope I'm posting this question to the correct forum. I am creating a small application, that will send a input voltage/frequency of 30Hz. So what my java program should do is to identify the voltage/frequency that was input to my computer and display it.
I am new to this, and i hope i made my question clear here. Basically what i need is to display the inputed voltage/frequency.
I have no clue of how to start. Can some one show me an example code, so i could study it and understand how it hapence.
Edited by: localpott on May 28, 2010 9:12 PM

localpott wrote:
I am new to this, and i hope i made my question clear here. Basically what i need is to display the inputed voltage/frequency.
I have no clue of how to start. Can some one show me an example code...Start with [the tutorials|http://java.sun.com/docs/books/tutorial/]. Chances are, any code we suggest at this stage would be pointless, and wouldn't help you to learn.
One question though: How were you planning on passing in the voltages and frequencies?
Winston

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[ 2647.121]
X.Org X Server 1.10.1
Release Date: 2011-04-15
[ 2647.121] X Protocol Version 11, Revision 0
[ 2647.121] Build Operating System: Linux 2.6.38-ARCH i686
[ 2647.121] Current Operating System: Linux zielony 2.6.38-ARCH #1 SMP PREEMPT Fri Apr 22 17:48:36 UTC 2011 i686
[ 2647.121] Kernel command line: rootfstype=ext4 root=/dev/disk/by-uuid/f411ac84-e2f1-4e1a-84ec-1083a7f7a165 ro
[ 2647.121] Build Date: 16 April 2011 12:05:35PM
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[ 2647.121] Before reporting problems, check http://wiki.x.org
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[ 2647.121] (==) Log file: "/var/log/Xorg.0.log", Time: Thu Apr 28 21:01:34 2011
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/usr/share/fonts/Type1/,
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[ 2647.122] X.Org Video Driver: 10.0
[ 2647.122] X.Org XInput driver : 12.2
[ 2647.122] X.Org Server Extension : 5.0
[ 2647.122] (--) PCI:*(0:1:0:0) 10de:06e4:107d:2707 rev 161, Mem @ 0xfa000000/16777216, 0xd0000000/268435456, 0xf8000000/33554432, I/O @ 0x0000bc00/128, BIOS @ 0x????????/131072
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[ 2647.122] (II) LoadModule: "extmod"
[ 2647.122] (II) Loading /usr/lib/xorg/modules/extensions/libextmod.so
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[ 2647.122] compiled for 1.10.1, module version = 1.0.0
[ 2647.122] Module class: X.Org Server Extension
[ 2647.123] ABI class: X.Org Server Extension, version 5.0
[ 2647.123] (II) Loading extension MIT-SCREEN-SAVER
[ 2647.123] (II) Loading extension XFree86-VidModeExtension
[ 2647.123] (II) Loading extension XFree86-DGA
[ 2647.123] (II) Loading extension DPMS
[ 2647.123] (II) Loading extension XVideo
[ 2647.123] (II) Loading extension XVideo-MotionCompensation
[ 2647.123] (II) Loading extension X-Resource
[ 2647.123] (II) LoadModule: "dbe"
[ 2647.123] (II) Loading /usr/lib/xorg/modules/extensions/libdbe.so
[ 2647.123] (II) Module dbe: vendor="X.Org Foundation"
[ 2647.123] compiled for 1.10.1, module version = 1.0.0
[ 2647.123] Module class: X.Org Server Extension
[ 2647.123] ABI class: X.Org Server Extension, version 5.0
[ 2647.123] (II) Loading extension DOUBLE-BUFFER
[ 2647.123] (II) LoadModule: "glx"
[ 2647.123] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[ 2647.135] (II) Module glx: vendor="NVIDIA Corporation"
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[ 2647.135] Module class: X.Org Server Extension
[ 2647.135] (II) NVIDIA GLX Module 270.41.06 Mon Apr 18 15:11:28 PDT 2011
[ 2647.135] (II) Loading extension GLX
[ 2647.135] (II) LoadModule: "record"
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[ 2647.136] (II) Module record: vendor="X.Org Foundation"
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[ 2647.136] Module class: X.Org Server Extension
[ 2647.136] ABI class: X.Org Server Extension, version 5.0
[ 2647.136] (II) Loading extension RECORD
[ 2647.136] (II) LoadModule: "dri"
[ 2647.136] (II) Loading /usr/lib/xorg/modules/extensions/libdri.so
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[ 2647.136] ABI class: X.Org Server Extension, version 5.0
[ 2647.136] (II) Loading extension XFree86-DRI
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[ 2647.136] (II) Loading /usr/lib/xorg/modules/extensions/libdri2.so
[ 2647.136] (II) Module dri2: vendor="X.Org Foundation"
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[ 2647.136] ABI class: X.Org Server Extension, version 5.0
[ 2647.136] (II) Loading extension DRI2
[ 2647.136] (II) LoadModule: "nvidia"
[ 2647.136] (II) Loading /usr/lib/xorg/modules/drivers/nvidia_drv.so
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[ 2647.136] Module class: X.Org Video Driver
[ 2647.136] (II) NVIDIA dlloader X Driver 270.41.06 Mon Apr 18 14:55:51 PDT 2011
[ 2647.136] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
[ 2647.136] (++) using VT number 8
[ 2647.139] (II) Loading sub module "fb"
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[ 2647.139] (II) Loading /usr/lib/xorg/modules/libfb.so
[ 2647.139] (II) Module fb: vendor="X.Org Foundation"
[ 2647.139] compiled for 1.10.1, module version = 1.0.0
[ 2647.139] ABI class: X.Org ANSI C Emulation, version 0.4
[ 2647.139] (II) Loading sub module "wfb"
[ 2647.139] (II) LoadModule: "wfb"
[ 2647.139] (II) Loading /usr/lib/xorg/modules/libwfb.so
[ 2647.139] (II) Module wfb: vendor="X.Org Foundation"
[ 2647.139] compiled for 1.10.1, module version = 1.0.0
[ 2647.139] ABI class: X.Org ANSI C Emulation, version 0.4
[ 2647.139] (II) Loading sub module "ramdac"
[ 2647.139] (II) LoadModule: "ramdac"
[ 2647.139] (II) Module "ramdac" already built-in
[ 2647.139] (II) Loading /usr/lib/xorg/modules/drivers/nvidia_drv.so
[ 2647.139] (II) Loading /usr/lib/xorg/modules/libwfb.so
[ 2647.139] (II) Loading /usr/lib/xorg/modules/libfb.so
[ 2647.139] (**) NVIDIA(0): Depth 24, (--) framebuffer bpp 32
[ 2647.139] (==) NVIDIA(0): RGB weight 888
[ 2647.139] (==) NVIDIA(0): Default visual is TrueColor
[ 2647.139] (==) NVIDIA(0): Using gamma correction (1.0, 1.0, 1.0)
[ 2647.139] (**) NVIDIA(0): Option "NoLogo" "True"
[ 2647.485] (II) NVIDIA(GPU-0): Display (Sony SDM-HS95P (DFP-0)) does not support NVIDIA 3D
[ 2647.485] (II) NVIDIA(GPU-0): Vision stereo.
[ 2647.485] (II) NVIDIA(0): NVIDIA GPU GeForce 8400 GS (G98) at PCI:1:0:0 (GPU-0)
[ 2647.485] (--) NVIDIA(0): Memory: 524288 kBytes
[ 2647.485] (--) NVIDIA(0): VideoBIOS: 62.98.29.00.38
[ 2647.485] (II) NVIDIA(0): Detected PCI Express Link width: 16X
[ 2647.485] (--) NVIDIA(0): Interlaced video modes are supported on this GPU
[ 2647.485] (--) NVIDIA(0): Connected display device(s) on GeForce 8400 GS at PCI:1:0:0
[ 2647.485] (--) NVIDIA(0): Sony SDM-HS95P (DFP-0)
[ 2647.485] (--) NVIDIA(0): Sony SDM-HS95P (DFP-0): 330.0 MHz maximum pixel clock
[ 2647.485] (--) NVIDIA(0): Sony SDM-HS95P (DFP-0): Internal Dual Link TMDS
[ 2647.554] (II) NVIDIA(0): Assigned Display Device: DFP-0
[ 2647.554] (II) NVIDIA(0): Validated modes:
[ 2647.554] (II) NVIDIA(0): "1024x768"
[ 2647.554] (II) NVIDIA(0): "800x600"
[ 2647.554] (II) NVIDIA(0): "640x480"
[ 2647.554] (II) NVIDIA(0): Virtual screen size determined to be 1024 x 768
[ 2647.590] (--) NVIDIA(0): DPI set to (68, 65); computed from "UseEdidDpi" X config
[ 2647.590] (--) NVIDIA(0): option
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[ 2647.591] (II) NVIDIA: Using 768.00 MB of virtual memory for indirect memory access.
[ 2647.597] (II) NVIDIA(0): Setting mode "1024x768"
[ 2647.619] (II) Loading extension NV-GLX
[ 2647.651] (==) NVIDIA(0): Disabling shared memory pixmaps
[ 2647.651] (==) NVIDIA(0): Backing store disabled
[ 2647.651] (==) NVIDIA(0): Silken mouse enabled
[ 2647.652] (==) NVIDIA(0): DPMS enabled
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[ 2647.652] (II) Loading extension XINERAMA
[ 2647.652] (II) Loading sub module "dri2"
[ 2647.652] (II) LoadModule: "dri2"
[ 2647.652] (II) Loading /usr/lib/xorg/modules/extensions/libdri2.so
[ 2647.652] (II) Module dri2: vendor="X.Org Foundation"
[ 2647.652] compiled for 1.10.1, module version = 1.2.0
[ 2647.652] ABI class: X.Org Server Extension, version 5.0
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[ 2647.652] (II) Initializing built-in extension Generic Event Extension
[ 2647.652] (II) Initializing built-in extension SHAPE
[ 2647.652] (II) Initializing built-in extension MIT-SHM
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[ 2647.652] (II) Initializing built-in extension XTEST
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[ 2647.652] (II) Initializing built-in extension SYNC
[ 2647.652] (II) Initializing built-in extension XKEYBOARD
[ 2647.652] (II) Initializing built-in extension XC-MISC
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[ 2647.122] (II) The server relies on udev to provide the list of input devices.
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udi = '/org/freedesktop/Hal/devices/platform_i8042_i8042_KBD_port_logicaldev_input'
info.addons.singleton = {'hald-addon-input'} (string list)
info.capabilities = {'input', 'input.keyboard', 'input.keypad', 'input.keys', 'button'} (
string list)
info.category = 'input' (string)
info.parent = '/org/freedesktop/Hal/devices/platform_i8042_i8042_KBD_port' (string)
info.product = 'AT Translated Set 2 keyboard' (string)
info.subsystem = 'input' (string)
info.udi = '/org/freedesktop/Hal/devices/platform_i8042_i8042_KBD_port_logicaldev_input'
(string)
input.device = '/dev/input/event0' (string)
input.originating_device = '/org/freedesktop/Hal/devices/platform_i8042_i8042_KBD_port'
(string)
input.product = 'AT Translated Set 2 keyboard' (string)
input.x11_driver = 'evdev' (string)
input.xkb.layout = 'us' (string)
input.xkb.model = 'evdev' (string)
input.xkb.rules = 'base' (string)
input.xkb.variant = '' (string)
linux.device_file = '/dev/input/event0' (string)
linux.hotplug_type = 2 (0x2) (int)
linux.subsystem = 'input' (string)
linux.sysfs_path = '/sys/devices/platform/i8042/serio0/input/input0/event0' (string)
I'd be really grateful for helping me with reparing hal input devices recognition.
Last edited by Zielony (2011-04-28 22:35:24)

So I have standard configuration files:
root:~# ls /etc/X11/xorg.conf.d/
10-evdev.conf 10-monitor.conf 10-quirks.conf 20-nvidia.conf
And all hapilly worked until yesterday. The changes could be caused only by tty group user adding or recent updates:
[2011-04-27 18:10] Running 'pacman -Syu'
[2011-04-27 18:10] synchronizing package lists
[2011-04-27 18:10] starting full system upgrade
[2011-04-27 18:17] upgraded git (1.7.4.4-1 -> 1.7.5-1)
[2011-04-27 18:17] upgraded ilmbase (1.0.1-1 -> 1.0.2-1)
[2011-04-27 18:17] >>>
[2011-04-27 18:17] >>> If you use the LILO bootloader, you should run 'lilo' before rebooting.
[2011-04-27 18:17] >>>
[2011-04-27 18:17] >>> Updating module dependencies. Please wait ...
[2011-04-27 18:17] >>> MKINITCPIO SETUP
[2011-04-27 18:17] >>> ----------------
[2011-04-27 18:17] >>> If you use LVM2, Encrypted root or software RAID,
[2011-04-27 18:17] >>> Ensure you enable support in /etc/mkinitcpio.conf .
[2011-04-27 18:17] >>> More information about mkinitcpio setup can be found here:
[2011-04-27 18:17] >>> http://wiki.archlinux.org/index.php/Mkinitcpio
[2011-04-27 18:17]
[2011-04-27 18:17] >>> Generating initial ramdisk, using mkinitcpio. Please wait...
[2011-04-27 18:17] ==> Building image "default"
[2011-04-27 18:17] ==> Running command: /sbin/mkinitcpio -k 2.6.38-ARCH -c /etc/mkinitcpio.conf -g /boot/kernel26.img
[2011-04-27 18:17] :: Begin build
[2011-04-27 18:17] :: Parsing hook [base]
[2011-04-27 18:17] :: Parsing hook [udev]
[2011-04-27 18:17] :: Parsing hook [autodetect]
[2011-04-27 18:17] :: Parsing hook [pata]
[2011-04-27 18:17] :: Parsing hook [scsi]
[2011-04-27 18:17] :: Parsing hook [sata]
[2011-04-27 18:17] :: Parsing hook [filesystems]
[2011-04-27 18:17] :: Generating module dependencies
[2011-04-27 18:17] :: Generating image '/boot/kernel26.img'...SUCCESS
[2011-04-27 18:17] ==> SUCCESS
[2011-04-27 18:17] ==> Building image "fallback"
[2011-04-27 18:17] ==> Running command: /sbin/mkinitcpio -k 2.6.38-ARCH -c /etc/mkinitcpio.conf -g /boot/kernel26-fallback.img -S autodetect
[2011-04-27 18:17] :: Begin build
[2011-04-27 18:17] :: Parsing hook [base]
[2011-04-27 18:17] :: Parsing hook [udev]
[2011-04-27 18:17] :: Parsing hook [pata]
[2011-04-27 18:17] :: Parsing hook [scsi]
[2011-04-27 18:17] :: Parsing hook [sata]
[2011-04-27 18:17] :: Parsing hook [filesystems]
[2011-04-27 18:17] :: Generating module dependencies
[2011-04-27 18:17] :: Generating image '/boot/kernel26-fallback.img'...SUCCESS
[2011-04-27 18:17] ==> SUCCESS
[2011-04-27 18:17] upgraded kernel26 (2.6.38.3-1 -> 2.6.38.4-1)
[2011-04-27 18:18] upgraded kernel26-headers (2.6.38.3-1 -> 2.6.38.4-1)
[2011-04-27 18:18] upgraded libmad (0.15.1b-4 -> 0.15.1b-5)
[2011-04-27 18:18] upgraded mdadm (3.2.1-1 -> 3.2.1-3)
[2011-04-27 18:18] upgraded mpg123 (1.13.2-1 -> 1.13.3-1)
[2011-04-27 18:18] upgraded yajl (1.0.11-3 -> 2.0.0-2)
[2011-04-27 18:18] upgraded package-query (0.7-1 -> 0.8-1)
Previously to use input devices I didn't have to have installed xf86-input-{mouse,keyboard}. Only now, when I use Option "AutoAddDevices" "false", it's needed.
Last edited by Zielony (2011-04-28 20:23:49)

Logic does not see my hd omni as an input device. Any ideas? I've been told to reinstall logicpro - but apple won't let me because it says its already installed on this machine.

Logic does not see my hd omni as an input device. Any ideas? I've been told to reinstall logicpro - but apple won't let me because it says its already installed on this machine.

I'm having the same issue with a file called IMG_2353.MOV that was imported into iPhoto from my iPhone and also have to manually select the items to import (so the rogue file doesn't error everything out). I've tried using Image Capture to locate/delete the file directly from my iPhone, but even though I can SEE it in Image Capture, I can't delete it or anything. This is VERY frustrating! My friend/Apple guru's only suggestion was to backup my phone then restore it through iTunes. Risky but should do the trick. I'm too scared to try, though!

Problem with Set/Get volume of input device with single channel

from Symadept <[email protected]>
to Cocoa Developers <[email protected]>,
coreaudio-api <[email protected]>
date Thu, Dec 10, 2009 at 2:45 PM
subject Problem with Set/Get volume of input device with single channel
mailed-by gmail.com
hide details 2:45 PM (2 hours ago)
Hi,
I am trying to Set/Get Volume level of Input device which has only single channel but no master channel, then it fails to retrieve the kAudioDevicePropertyPreferredChannelsForStereo and intermittently kAudioDevicePropertyVolumeScalar for each channel. But this works well for Output device.
So is there any difference in setting/getting the volume of input channels?
I am pasting the downloadable link to sample.
http://www.4shared.com/file/169494513/f53ed27/VolumeManagerTest.html
Thanks in advance.
Regards
Mustafa
Tags: MacOSX, CoreAudio, Objective C.

That works but the the game will not be in full screen, it will have an empty strip at the bottom.
I actually found out what's the problem. I traced the stageWidth and stageHeight during resizing event. I found out that when it first resized, the stage width and height were the size with the notification bar. So when I pass the stage into startling, myStarling = new Starling(Game,stage), the stage is in the wrong size. For some reason, I can only get the correct stage width and height after the third resizing event.
So now I need to restart Starling everytime a resizing event happened. It gives me the right result but I am not sure it is a good idea to do that.
And thanks a lot for your time kglad~I really appriciate your help.

I have a late 2011 model MacBook Pro running Mountain Lion. I love the AirPlay mirroring feature with Apple TV...BUT, how do I mirror with TVs that don't have Apple TV? I used to run a cable from my mini display port to the HDMI input of a TV.

I have a late 2011 model MacBook Pro running Mountain Lion. I love the AirPlay mirroring feature with Apple TV...BUT, how do I mirror with TVs that don't have Apple TV? I used to run a cable from my mini display port to the HDMI input of a TV. This feature seems to be lost in the Mountain Lion upgrade. Did Apple feel that once Mountain Lion came out that EVERYONE would have Apple TV? There are no settings in System Preferences/Display like there used to be...only for AirPlay Mirroring.

Running a cable to the HDMI port is still supported. (and still works on mine).
If the Arrangement tab in System Preferences > Displays isn't present then it doesn't recognize the physical connection. Double check all cables. If that doesn't work try a PRAM reset:
http://support.apple.com/kb/ht1379

How do I set up multiple midi-input devices:WX5 wind & keyboard controllers

Hello,
I'm trying to setup my system to utilize two midi input devices.
1. Novation Controller Keyboard connected through USB
2. WX5 wind controller connected via VL-70 tone module with midi out cable to channel 1 of my Motu midi interface.
As it is currently setup I am able to play both my Wind Controller and MIDI Keyboards fine, but for some reason whenever I finish playing the Wind Controller, the MIDI Keyboard no longer plays sound (it plays midi fine according to the transport, but no sound is created until I load another patch of the EXS).
What am I doing wrong? Should I be switching between inputs in Logic somehow? How can I setup my system to be able to jump back and forth between my midi keyboard and wind controllers? I have done no setup besides cabling the devices in the AudioMidi setup (outside of Logic).
Thank you in advance for any help you can provide!

This is just a guess, but if the last thing your wind controller puts out is a volume message of zero (as I think it would do as you stop playing the last note) then you would need to send a volume message to the sound module to reset it to the desired volume.

Can I use a MIDI keyboard as an input device for a software instrument?

I have a Casio CTK-2100 that I am currently playing around with in Logic Pro 9. It can record and playback the different instruments fine using MIDI tracks. But I was wondering if it is possible to use the keyboard as an input device for a software instrument instead of the "Step Input Keyboard".
Is it? If so, how do I set it up?

Yes, the terminology can be a bear, many, many years ago when I started using Logic the manuals were written completely by the programmers, while they were quite humorous in places the were also really hard to understand so I learned/realized.. you can't really do anything so wrong it's going to destroy your computer so why not go ahead and experiment. I learned the basics of Logic without a manual, months later when I went back to find some some details I could figure out the manual made a lot more sense.
Logic has been somewhat Appleized but it's not really an Apple program, it was purchased almost as developed as it is now... a lot of the additions a fluff to make it easier to understand for new users while at the same time there are some real improvements.
This is personal opinion: With all of the forums/online tutorials...etc...etc. It seems users are learning (but not understanding) the same things, plus everyone wants to use it right away so nobody takes a deep breath and investigates on their own. Logic is a deep, deep program, while learning don't be afraid to go off on a tangent and explore the program without any other input, it can actually be inspirational. One other thing good about the manual or "Online Help", in looking up a function you will invariably come across a related concept that will provide further insight.
And..... have fun.

How can I remove a Input device from my Mac?

Hello, I would like to know how I can remove a input device from the Sound area in System Preferences. I installed Wiretap Anywhere a sound input program for my Mac and did not realize It was not supported for Moutain Lion. I put the application in the trash and then emptied the trash can. Now whenever I try to start GarageBand or a program like that it crashes my computer. In the Input tab of Sound (System Preferences) It is listed as Wiretap: System Audio.
I would like to remove this from the Input tab so I can use my Mac reguarly. Any Ideas on how to fix it?
Thanks,
Justin

Any third-party software that doesn't install by drag-and-drop into the Applications folder, and uninstall by drag-and-drop to the Trash, is a system modification.
Whenever you remove system modifications, they must be removed completely, and the only way to do that is to use the uninstallation tool, if any, provided by the developers, or to follow their instructions. If the software has been incompletely removed, you may have to re-download or even reinstall it in order to finish the job.
Here are some general guidelines. Suppose you want to remove something called “BrickYourMac.” First, consult the product's Help menu, if there is one, for instructions. Finding none there, look on the developer's website, say www.brickyourmac.com. (That may not be the actual name of the site; if necessary, search the Web for the product name.) If you don’t find anything on the website or in your search, contact the developer. While you're waiting for a response, download BrickYourMac.dmg and open it. There may be an application in there such as “Uninstall BrickYourMac.” If not, open “BrickYourMac.pkg” and look for an Uninstall button.
You may have to log out or reboot in order to complete an uninstallation.
If you can’t remove software in any other way, you’ll have to erase your boot volume and perform a clean reinstallation of OS X. Never install any third-party software unless you're sure you know how to uninstall it; otherwise you may create problems that are very hard to solve.
Trying to remove complex system modifications by hunting for files by name often will not work and may make the problem worse. The same goes for "utilities" that purport to remove software.

How to generate a pwm whose duty cycle has to be varied depending on the frequency of the input trigger??

Sir/madam,
I am quite new to the Labview FPGA module.
I am currently working on an application where i have to generate a pwm to control the ON time duration . The pwm ON time depends on the frequency of an input signal.I want to retrieve the ON time value from a lookup table which contain the duty cycle values for the pwm at different frequencies of the input.This input also has to work as a trigger. The input is pulsed and the trigger has to generate the pwm at every rising edge. I am using a PCI 7831R- RIO series. I am urgently in need of some help and i have hardly a couple of weeks before i meet the deadline.
I am trying hard to learn the basics from the shipping examples but not able to quite make my vi work.
Kindly lend a helping hand and i would be very grateful to anybody who can help. Thanks a lot in advance.
Do ask in case of any clarifications required. I think i have explained my problem quite well.

Hello Manu,
You can refer
Developing a PWM Interface using LabVIEW FPGA or PWM Output with LabVIEW FPGA
How this helps.
Best Regards,
Hardik Asawa
AE
National Instruments
Message Edited by Hardik Asawa on 05-05-2010 12:46 AM

My old Intel-Based iMac is no longer recognizing USB wired input devices; it only recognizes Bluetooth. What happened?

My friend's old Intel-Based iMac is no longer recognizing USB-wired input devices (Kensington TrackBall, Logitech Mouse) plugged into any USB slot at the back of the computer.
They were working before and for many years.
All of a sudden, A pop up window came up. IT said no Bluetooth mice could be found. We don't know what set off that window to pop up and look for a WL mouse. It never has before in the 5 or more years my friend has been using this computer.
I supplied a wireless Apple mouse and his is back running again.
But want to know why his USB-input devices (Except his keyboard) are not being recognized. He would prefer to use his Trackpad (Wired), but can't find anything in SYstem PReferences to allow that. The computer only seems to want a Bluetooth input device.
Anyone have an idea what happened and if this can be reversed?
I think he is still running Mac OS X 10.5.8.

Hi Carol, lets try this...
reset FW bus, same goes for USB reset...
Reset the Firewire bus
If your Firewire or USB isn't recognizing any device. A solution which has worked for some whose hard drive became invisible in 10.4 was simply to follow these four steps to reset the Firewire/USB bus:
1. Shut the machine down.
2. UNPLUG the power lead to the computer and any firewire/USB drive/devices.
3. leave it for 10 minutes.
4. Connect back up and reboot.
http://www.macmaps.com/firewirebug2.html

How do I select a midi input device and record midi?

I have several midi input devices connected to my computer. I use them regularly with Digital Performer. I am trying to record a single midi track in Garage Band using an Oxygen 8 keyboard. In the preferences GB says that it sees 7 midi devices. How do I route midi with Garage Band and how do I tell Garage band which midi device to record from? When I create a midi track (well...I think that it is a midi track) and I try to record I do not see any midi notes being recorded.
Searching the help file for midi provided surprisingly little information. I am sure that this is simple stuff...perhaps so simple that I am missing something obvious.

Yes, if the controller sends the right MIDI messages
What do you mean by "the right midi messages"?
I have a virtual instrument (with for example) a delay effect knob. I would like to turn a knob on my midi controller and adjust the delay in the virtual instrument (as I can in just about any other sequencer). Can GarageBand do this, if so, how?

Display voltage/frequency of a input device beginner question

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