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Author Topic:   Strange submixing
Yuri Spitsin
Member
posted 10 May 2002 06:08         Edit/Delete Message   Reply w/Quote

diskrec.ktl

 
Hello, community.

There is a simple timeline attached, demonstrating a strange behaviour of submixes.

There are two tracks on the timeline.
First track is just 10 sec sample player.
Second track consists of two 5_sec_capture disk recorders placed one after another, creating two sound files, respectively - 'record1' and 'record2'.
First track's output is send to submix 'Rec', which is set as the input for the second track.
As a result we expect first 5 secs of sample being recorded in the 'record1' file, and last 5 secs - in the 'record2'.
Surprisingly, what we get is the first 5 secs of the sample recorded to both files, so they are identical.

How could this be explained?

This effect appears only if submix is used as the track's input - if we switch it to the audio input, everything is recorded perfectly.

Thanks.
-yuri.

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SSC
Administrator
posted 10 May 2002 10:23         Edit/Delete Message   Reply w/Quote
You can work around this behavior by putting !FadeInOut into the Gate field of the DiskRecorder. This will cause the recording to start at the right time.

When Kyma plays a timeline, it first creates a Sound that is equivalent to the timeline, and then plays that Sound.

With submixes, what you are specifying is that the submix will be supplied as an input to the Sounds in the track using that submix. This is simple when there is one Sound in the track and the time span of the Sound equals or exceeds that of the submix.

When there is more than one Sound in the track, or when the Sound has a shorter time span than the submix, things have to be handled differently. Each Sound in the track is stretched to the same length as the submix. Since each Sound has a FadeInOut envelope, you will hear the output of these Sounds only during the times that you had specified in the timeline.

However, when the Sound has a side effect (like writing to a disk file), that side effect begins at the same time as the submix starts. That is why using !FadeInOut in the Gate field would make this work.

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Yuri Spitsin
Member
posted 10 May 2002 15:27         Edit/Delete Message   Reply w/Quote
Thanks for explanations and advice, but alas - using !FadeInOut didn't change anything. I even left only one 'DiskRecorder' sound on the track using submix input. Whatever time position ontrack you put the recorder, it starts to record at the very moment when submix sender starts to play - so it efficiently sticks to the source sound's !FadeInOut, not to its own. Though visually all indicators on the timeline flash at the right moments - but this indication is misleading.
I tried to work around using TimeOffset with DiskRecorder. I got a half of success - playback began at the right timepoint, but what was played back was the same initial fragment of sample.

-yuri.

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SSC
Administrator
posted 12 May 2002 12:06         Edit/Delete Message   Reply w/Quote
You could make a Master control in the time line that steps at the time the recording should start. Then use that control in the Gate field of the DiskRecorder.

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Yuri Spitsin
Member
posted 12 May 2002 14:22         Edit/Delete Message   Reply w/Quote
Dear SSC, thanks for new idea.
Strange, but i couldn't check if this trick works, because DiskRecorder stopped to record at all - even the first one, even without any changes. Am too busy at the moment (finishing new composition for the festival to perform in three days) for this problem to solve. Will go back to this - because i need this functionality for the future applications.
Working for two weeks on the composition and seriously using the timeline for the first time - i love it!


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