I’ve finally resolved the issue that was affecting some ASR-10’s from working properly with the SCSI board.
I’ll do another post with an in-depth discussion of the issue, but I’m almost certain that this issue affects the original Ensoniq SCSI boards as well. Unfortunately I sold the only genuine SP-3 board that I owned, however I’m building a few of the older generation of the SCSI board (which is 99% the same as the Ensoniq board) to verify this.
If you have an original Ensoniq SCSI board in your ASR-10, you can check for the problem by toggling between 30kHz and 44.1kHz. At 44.1kHz you will hear distortion or audio artifacts. It doesn’t happen every time you switch, and it will sound slightly different each time.
If it turns out the problem does exist on the original SCSI boards, I will be offering a solution to fix it.
I confirm that this issue is plaguing the original SP-3 boards as well. I own one of such boards.
When installed, using any of 44.1 kHz effects (or no effect, but toggled to 44.1 sample rate) generates very loud artifacts. It’s very loud, unpleasant, crackling distortion-like noise, which get worse over time as the machine warms up (usually within 20-30 mins). I’m 100% confident it’s the SP-3 board as it’s happening only when this specific board is installed and none of my other SP-3 boards do this.
It’d be amazing if you have found cure for this problem. Please do let us know.
Happy New Year!