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Author Topic:   Recording Audio
mk23
Member
posted 09 January 2004 08:29         Edit/Delete Message   Reply w/Quote

Ok so over the festive season I finally got some time to myself to try and record some time lines I use for live performance. Imagine my frustration when I realised that my capy, which should atleast be able to manage playing back or recording a stereo signal, just records every 3 out of 4 beats!

The system details:
P2 500 mhz, 256mb RAM, 10gb 7200 rpm hard disk (only udma 33 though). Im still using Kyma 5 (latest from the net!) on Win 98 se 2 running Cubase 5 just sending midi to yamaha sampler, audio out from this goes into capybara. What seems strange is that if i run the standard tape recorder tool i can record fine, its just when I try and use a disk recorder in a timeline. The timeline will compile and run perfectly, playing back the sound as epected but the recording when played back is missing every 4th beat! and thats just on 1 track, before i even think about trying more than stereo playback (

I have tried having a bit of a play about with things, shuffeled IRQ numbers to try and make sure capy has its own IRQ and is not sharing with any other card. I have tried 2 different graphics cards, one of which is an ATI card which lets me record with my standard 10 pound soundcard and playback atleast 10 tracks off the drive within VST faultlessly!

Any suggestions on what I could try tweaking with now?

Regards

Dave Moss

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SSC
Administrator
posted 09 January 2004 11:29         Edit/Delete Message   Reply w/Quote
" just records every 3 out of 4 beats!"

Is this true even if you change the tempo? Or is it just a coincidence that the drop outs occur on the beat? Do you hear silence every 4th beat? Are you using any MIDI triggers in your Kyma Sounds? Is the DiskRecorder the only Sound in your Timeline?

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mk23
Member
posted 12 January 2004 05:55         Edit/Delete Message   Reply w/Quote
Hi,
So I have had time to delve deeper and in response to your message:

I have tried to use use a disk recorder 1st put inside one of my sounds in the timeline, I tried various lengths of record time (from 10 seconds to 1000). None of this worked so i then tried using a disk recorder within its own sound in the timeline, again with either 0 seconds capture or up to 700 seconds.

As regards the problem I have tried varying the beats and bpm settings which come up when compiling a disk recorder sound, the track runs at 18- bpm and I have tried anything from 60 bpm to 300 bpm.

However the problem always sounds the same, I record the file (I have now tried 2 different hard disks BTW, both udma 33 7200 rpms, both same audio glitches!) and when it plays back it is like every 4th beat has been cut out of the file. Trying the exact same figures for all variables in the time line creates files with different missing parts, but I guess this is because I am triggereing the record with variable 1 so it starts recrding as soon as compiled and I am not even trying to synchronise this with the midi (being played from Cubase).

Arrgh I cant think of anything else. I have tried to go back to basics and just record the audio input via the tape recorder tool, exactly the same problem so I have a feeling its PCI bus related.

Ideas appreciated.....

Dave mK

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SSC
Administrator
posted 12 January 2004 09:43         Edit/Delete Message   Reply w/Quote
"Im still using Kyma 5 (latest from the net!) on Win 98 se 2 running Cubase 5 just sending midi to yamaha sampler, audio out from this goes into capybara. "

Can you bring Kyma to the foreground and try your experiment again? Since it is related to the beat (no matter what the tempo), it could be that Cubase is using some extra CPU time once per bar to update displays for the next bar. It might be stealing that time from Kyma5 running in the background and preventing it from writing to disk during that time. Kyma5 should not be in the background if it is doing disk accesses. (In Kyma X, this problem has been fixed).

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