I tried to access the FAQ entries from the links you included but I just get an Access Denied error. The SRS Audio Essentials device and the IDT sound card are currently set to DVD quality (16 bit, 48000 Hz). The audio quality setting of the DDMF Virtual Audio device is fixed at CD Quality (16 bit, 44100 Hz). I also tried bypassing SRS and outputting directly to my IDT High Definition Audio device but this does not resolve the issue. (You can also download a free demo version of that product at the above address.) The output is currently the SRS Audio Essentials device, which is installed with SRS Audio Essentials: I tried switching from Stream 1 to one of the other streams in the Rack Performer Configuration dialog after the problem developed to see whether that would temporarily cure the problem but it did not make any difference at all.

There are four Virtual Audio Streams in all. The demo version adds some white noise every now and then but that is NOT the same as the problem that I am experiencing!) (I am using the paid-for version but you can download and install a free demo version from the above address. The input is from a VIRTUAL Audio device called Stream 1, which is installed with DDMF's Virtual Audio Recorder software: I'm pretty sure I was experiencing the same issue with MME though. BTW this is a really great application - thanks for all your hard work developing it! This only worked sometimes - I don't know whether it is a timing/sync issue somehow? I often have to disable and re-enable power for the master modules several times (4 or 5 times) before it eventually works OK!? I hope that helps! Please let me know if I can help some more. I did find, however, that I could improve the audio quality by disabling and re-enabling the power of the master modules in Edit mode.

Neither did closing the application and restarting it. Disabling and re-enabling power in Patch mode also did not cure the problem. (I tried connecting the input module (stereo multipurpose master) directly to the master module with no VST modules in-between but the crackle and stutter remained.) I tried different master modules but this made no difference. I isolated the issue to Rack Performer (I can immediately cure the problem by routing the same audio source to a different application and/or directly to another audio output device.) This is also not due to a faulty VST plugin.

After several hours of use a very distinct crackle and stutter begin to occur until the audio quality is so bad that it is unusable.

Cannot install virtual audio cable