How many channels can GB output?

I am new to GB, coming from the MIDI world. In my setup on another
computer I can use up to 112 MIDI channels.
I'd like to import my MIDI sequences to GB and play them with Apple
loops but from what an Apple salesman at a non-Apple Store told
me I can only output about 8 channels of music.
How can this be? I thought GB could even be used for film scoring.

how many tracks of software instruments & loops can be output
simultaneously?
a completely different question, so you meant input, not output:
http://www.bulletsandbones.com/GB/GBFAQ.html#maxtracks
(Let the page FULLY load. The link to your answer is at the top of your screen)

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I would like to write data from a large number of channel (up to 128) in a same file. Using the write data module, I have up to 16 channels only ! The only solution I found is to save data in 8 different files... Is there any solution to solve this problem ? I use DASYLAB V.12.00.00. Thank you
Solved!
Go to Solution.

Please see this knowledge base article describing how to do it.
http://kb.mccdaq.com/KnowledgebaseArticle50372.aspx?Keywords=multiplex
- cj
Measurement Computing (MCC) has free technical support. Visit www.mccdaq.com and click on the "Support" tab for all support options, including DASYLab.

How many tasks can I have in NI-DAQmx system?

I am working out of the office this week - please send your response to [email protected] as well as my normal email [email protected].
I am designing a new test platform that will run on C# (because we like object oriented text based programming and because the IDE is free). For hardware we'll use your PXI modules (because your hardware is ultra-reliable). I'm starting with the following PXI modules 6259, 4072, 6509, 2575, and 2569, but we made add other modules later as future requirements demand. I am doing the system software architecture now. I've done some dabbling with Ni_daqmx, and I loathe "tasks" and "channels", but am determined to make them work.
The difficulty I'm having revolves around the overhead with setting up tasks and channels and with the concept of tasks and channels. Help hasn't helped much. Tasks seem to work great if you intend to always collect the same large amount of data from many sources and always will do it in exactly the same way.
We want something much more akin to random access memory. We'll have UUTs of different kinds coming on and off at random times. Sometimes a test will need a simple DC voltage, and other times another test will need 2 seconds worth of data at 1MS/s. It can cost around 150msec to make that change (stop the current task, creat another one, configure anohter channel, start up a new task, blah, blah, task this, channle that - for the life of me I can't understand what this damn taks concept does for me but make matters more complicated and bog down my system).
I can just barely glean from the help that I can have only one analog input task at once, but I can have sevferal taks of several different kinds running at the same time ( a digital output task and another task for digital input, and another task for analong input, etc.) . It does seem that I can set realys without having to put them into a channel and a task (Thank goodness for that - I just wanna turn on a relay I have no idea what a relay "channel" might be.)
In the PXI system I described above I'll have two devices that are analog input devices, the DMM and the Daq. Even with two devices, can I only have one analog input task running? Does that mean I've got to waste 150msec just to switch from the DMM to the Daq? (Do you understand my frustration with "tasks"? - I should be able to say "read DMM" and turn around and say "read Daq channel 0" without having to jump thru task and channle hoops and waste a bunch of time doing it).
I'll also have Daq digital IO and two 6509 digital io modules. Do I have to cram all of that into some "task" concept too? The Daq card has got many other kinds of wonderful capability (frequency measurement, counters, analog output). How many tasks can I have for that stuff? On the DMM card I can measure capacitance amoung other things. Will I have a capacitance task? The idea of a "capacitance task" hurts my head.
Golly I hate tasks. Please help.
I am working out of the office this week - please send your response to [email protected] as well as my normal email [email protected].
Dave

Dave,
Thanks for posting to the NI Forums.
For the good of the community we like to keep conversations that start of the forums on the forums rather than moving to email. If you want to move to email support I recommend contacting NI through the email route.
I will answer your questions here. If you need more direct contact please feel free to contact us through [email protected].
For some the concept of tasks may seem daunting, however, for many applications it makes life a lot more simple. A task at a very fundamental level is simply a collection of channels with a single type (AI, DI, DO, etc.) and a single timing configuration (sampling rate, continuous vs. finite, etc.). It is a way to organize configuration data.
The concept of a task is an abstraction like OO programming. Like OO programming it may take some time to understand but can be a time saver in the end. Also like OO programming it does add some initial programming overhead. It is much more simple to simply type a printf statement in C than to have to create a bunch of classes just to output text to the screen. You can accomplish the same thing not using OO programming, but in the end OO programming is extremely useful, because it groups useful information and methods together in one place.
With very simple applications OO programming sometimes does not make sense. But as a program gets more and more complex OO programming becomes more and more useful. It takes some learning but it is worth it.
I believe the concept of a task does the same thing. It does not change the actual functionality of the device or add excessive overhead. It is just an abstraction that pulls configuration data about a specific "task" and methods the task can perform into a single logical place.
Unlike the entirely abstract concept of an Object, a Task is run on a physical device and therefore has physical limitations. You can create multiple tasks of the same type, but you can only run a one timed task of each type on a single board at a time. In other words you can have multiple AI tasks running at the same time but they need to run on different boards or only one can be timed (have a rate). You can also have multiple timed AI tasks configured for a single board but only one can actually be running at a time.
The reason you can only have a single timed task running at a time is because the M-Series boards (and many other boards as well) have a single timing engine for each type of acquisition or generation. There is a single timing engine for AI, one for AO, and so forth. You cannot have channel 1 running at 1 MS/s and another running at 50 kS/s.
However, tasks can exist even when they are not being actively run. You can create all the tasks you need at the beginning of your program and simply start and stop them as you need. After the task is stopped you do not need to clear the task until the end of your program. You can further increase performance by moving the Task into the latest state possible without actually starting the task. This can be done by calling myTask.Control(TaskAction.Action). The Task states are further explained in the NI-DAQmx Help Manual.
The concept of a task will need to be used with any device that is being programmed using NI-DAQmx. The 6259 and 6509 will need to be programmed using DAQmx. With the 2575 and 2569 you have the choice of either using the NI-DAQmx API or the NI-SWITCH API. The SWITCH API does not use the concept of tasks. For the 4072 you will need to use the NI-DMM API. This API also does not use the concept of tasks.
Hopefully this information is helpful. Let me know if you have any additional questions or concerns.
Regards,
Neil S.
Applications Engineer
National Instruments

How many keys can be pressed at once

i want to play an online rhythm music game.. which would require the pressing of more than one key at one time.. so I wish to know how many keys can be pressed at once without the computer hanging or the keyboard jamming?
I'm using a Macbook, 2.0ghz, Black with 1 gig ram. Thanks.

By and large the keyboard does what the programmer of the software tells it to do - part of the programming is to address the input/output devices required by the application. By the same token the programmer can't require you to use keystrokes that can't be addressed through the OS involved.
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Thank you so much...
1. I don't have that fat format I checked as I saw this on another answer...BUT...you are right the project was very bloated and I made a new project with the sequence and moved a bunch of projects off to an outside drive and things are flying again...this effect "twirl" was on three clips and this seemed to be creating a problem along with it being a bloated project. Don't know why this effect renders easily then the next second doesn't it's on three clips on the entire project and one or another might not render all of a sudden.
2. I understand what you said about the timeline export...I decided to export the sequence without the matte it was nested in and that sequence did have the chapter markers on the timeline and they again didn't export??? I'll look tomorrow at this it makes no sense if what you're saying is how to do it...the final cut pro book said they should have showed up if I export from the browser and that didn't work either.
3. I then matted that output and rendered it to output but I am worried this will degrade and compress the sequence more than I want by outputting the same sequence with current settings twice???...the couple of outputs I could make nested looked very good as this was one render...however, I tried doing a quicktime "current settings" with the dvd studio pro info still trying to export chapter markers and maybe it's my imagination but the output didn't look as sharp as just an output with just chapter markers???
r. I did look at the final cut pro book and it says that mpeg 2 movies will not read chapter markers anyway if you create one in compressor...if this is true it makes no difference if the quicktime output isn't having chapter markers show up. I assume when I go to author though I can put an mpeg 2 movie into dvd studio pro and create chapter markers at that point!! It seems weird it says it can do it with an mpeg 1 but not an mpeg 2 when everyone is using that for dvds.

Is their a way to find out how many channels in DAQmx code?

Hi I am using DAQmx VI's to aquire voltage and temperature. Is there a way to know how many channels were chosen from each individual Create Channel VI without looking at the physical channels input control? For example with the physical channel input of "cDAQ1Mod2/ai0:3" I know I have 4 channels selected, however, I want to use the number of channels that were selected my the user which can change depending on the user input.
Attachments:
Multichannel_After_mod.vi ‏34 KB

You can simply use the Task property, Number of Channels. Use one after the voltage tasks and one after the temperature task. The rest is just subtaction.

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I have a medical users that uses Epocrates, Tarascan, Clinical Consult, and Sandoth.
The phone 8330 gets slowed down and I am assuming this is a memory problem. So i need to confirm this so i can recommend a diferrent platform for her if necessary.
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Hi and Welcome to the Forums!
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Occam's Razor nearly always applies when troubleshooting technology issues!
If anyone has been helpful to you, please show your appreciation by clicking the button inside of their post. Please click here and read, along with the threads to which it links, for helpful information to guide you as you proceed. I always recommend that you treat your BlackBerry like any other computing device, including using a regular backup schedule...click here for an article with instructions.
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Hi! How many decibels can the iPod Shuffle (4th generation) go up to?

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How many counters can I use simultaneously?

I have cDAQ-9172 and 9411.
From the specification of 9411, there are 6DI channels of 9411.
The NI-DAQmx help say
Note PFI terminals are available when the device is installed in slot 5 or slot 6 of an NI cDAQ-9172 chassis.
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http://www.vitst.com
Virry Test & Control
LabVIEW Certified Developer
Solved!
Go to Solution.

Hi QIA,
The cDAQ-9172 has 2 counters that can be used simultaneously, and you're correct that installing your NI 9411 in slot 5 or slot 6 will allow you to access those counters. Any of the 6 DI lines on your 9411 can be used to access the inputs to either counter.
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dittoit,
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How many channels can GB output?

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