audible whine tracks buffer size

I am using an L22 Lstream interface to connect to an Aurora 8. For some time, I have heard a faint audible whine in the background, and unable to locate it using the "usual" methods (cable re-routing, etc.), I have just been living with it until I eventually hopefully figure it out. I now have a clue.

The ASIO buffer size in my system is set to 64. If I increase it to 128, this whine drops in pitch by one octave. If I increase the buffer size to 256, it drops by another octave, etc.

Any suggestions on how to get rid of this whine entirely?

thanks

Keith

Paul:

I believe that the whine is MORE pronounced on the signal that originates with the L22 analog output. The cabling from the L22 to the Aurora 8 also contains the signal path from the L22 analog output in the same cable bundle. Way back when I acquired this setup, I had your recommended cable maker at that time build a custom cable that included the analog output, because I did not want to lose access to that output when using the "standard" Lstream cable.

I think what I need to do is go spelunking behind my setup (which includes the cabling for a 32-channel analog mixer) and disconnect the cable from the L22 analog output and see if that makes a difference. That will take a little time, however, and I'll report back when I have done this.

Or, is there a way that I can disable the L22 analog output?

Keith