In a previous thread, H2000 reported that Senderella (and later MixBox) were causing glitches in rendered output. To level the playing field, I wrote two simple plugins... basically a send-receive pair that did the minumum amount of processing necessary to get audio from one bus to another. The experiment setup was simple:
1. Recorded a 20 second 440Hz sine in SF and saved it as a 44.1K 24 bit wav.
2. Imported the sine wav file into Vegas and set up 2 aux buses.
3. Sent the output of the sine wave audio track to Bus A.
4. Inserted "send" VST into Bus A and "receive" VST into Bus B.
5. Soloed Bus A and B and dropped Bus A volume slider to -inf.
Running with this setup will give you a clean sine tone on Bus B's output.
Then I rendered the output in a few different formats all at 44.1K, pulled them into SF and took a listen/look.
24 bit wav file - glitches all over the place, most notably on the left channel.
16 bit wav file - same as 24 bit wav file.
256K wma file - you gotta see/hear this one to believe it!
256K mp3 file - clean render, couple of small conversion artifacts.
Sony pca file - totally clean render
I guess I'd conclude from this that Senderella, MixBox and my two simple VSTs aren't the problem. Its clearly related to the way that wav and wma files are rendered although I can't tell how.
The same sine audio file sent to a single bus with a random VST processor inserted into the bus then rendered as a wav file does not display the glitching... it looks like just a bus to bus transfer causes the problem to happen.
canum
1. Recorded a 20 second 440Hz sine in SF and saved it as a 44.1K 24 bit wav.
2. Imported the sine wav file into Vegas and set up 2 aux buses.
3. Sent the output of the sine wave audio track to Bus A.
4. Inserted "send" VST into Bus A and "receive" VST into Bus B.
5. Soloed Bus A and B and dropped Bus A volume slider to -inf.
Running with this setup will give you a clean sine tone on Bus B's output.
Then I rendered the output in a few different formats all at 44.1K, pulled them into SF and took a listen/look.
24 bit wav file - glitches all over the place, most notably on the left channel.
16 bit wav file - same as 24 bit wav file.
256K wma file - you gotta see/hear this one to believe it!
256K mp3 file - clean render, couple of small conversion artifacts.
Sony pca file - totally clean render
I guess I'd conclude from this that Senderella, MixBox and my two simple VSTs aren't the problem. Its clearly related to the way that wav and wma files are rendered although I can't tell how.
The same sine audio file sent to a single bus with a random VST processor inserted into the bus then rendered as a wav file does not display the glitching... it looks like just a bus to bus transfer causes the problem to happen.
canum