Re: Audio Input latency over 1 second sometimes.....

Question

This is a BUG in a recent Logic update that I did unfortunately.
Logic Pro 9 on imac24" had been working flawlessly for many months in my studio.
Audio from my various synths is going into the iMac via a fader panel via spdiff. Also main synth (Korg Oasys) is also going midi in to the iMac.
After this recent update from Apple on fresh powerup and Logic started and a Yamaha piano grand selected on Logic and 12String Guitar selected on my Korg Oasys, the following happens.
When I press say the middle C on the Korg, right away the Yamaha plays the C.
Then after about 1 second delay, the Guitar sounds.
Then I quit Logic, then restart Logic and everything works fine till the next time I do a fresh powerup.
This is very silly to have to go through every single day......
Anyone have any ideas?
CPU load always show very low load always.....

Answer 1

{quote:title=45rpm wrote:
I know that you said earlier that you're using spdif. I asked you for more information about this, because your iMac does not have a standard spdif jack. It does not have a standard toslink jack. Your Roland has a toslink jack, and you're using some kind of adapter or separate device to connect this to your iMac. If you have another device here, I am considering the possibility that it's somehow contributing to the problem.}{quote}
From apple.com, my iMac has:
"Audio line in/optical digital audio input (minijack)"
This is where the Roland Toslink output is plugged into. There is no separate adapter needed. The iMac is able to understand the standard Optical frames via the fibre optic cable. We need to move on from this connection as it works as designed.
{quote:title=45rpm wrote:
I don't understand the scenario you're describing. Is the instrument generating the sound a Logic software instrument, or one of your hardware synths? What happens if you press a key on the Caps Lock keyboard, instead of pressing a key on your synth?
} {quote}
I apologize in advance if i am not patient enough and i appreciate all the help you guys are offering... but why would you ask about pressing a key on the Caps Lock keyboard? As explained earlier, in addition to generating music from its own sound engine, the Synth supplies the MIDI data straight into the iMac via USB. The iMac sees the synth Keystrokes in perfect realtime and plays whatever instrument I select in Logic...in perfect real time. Its the Analog being generated from the synth engine that gets delayed until I putz with perhaps the .plist file. (read Eriksimon's comment above). In my very first post I explained that I had selected a Yamaha Piano (a Logic Instrument) and a Steel Guitar (An instrument on the Synth) setup. So when I hit a middle C on the Synth, the Logic Instrument Yamaha AND the Synth Instrument Guitar should sound at the same time. But they don't...until I putz with the .plist file. Hope this clarifies the confusion?
Help me out here Eriksimon. You seem to get what i am faced with.
{quote:title=45rpm wrote:
Via what audio interface? What happens if you monitor via built-in audio instead? What happens if you try a new OS X user account?
} {quote}
The Audio Outjack from the iMac is wired to the Audio Amp via an stereo cable with RCA connectors. There is no difference in sound if I use built-in iMac speakers.
I have not tried using a different account. Should I?