Distorted audio with new MacEffects Thunder PDS accelerator in an LC II

jasa1063

New Tinkerer
May 30, 2022
40
24
8
I just picked up a MacEffects Thunder PDS accelerator. With the accelerator installed the audio is distorted. Has anyone else had this problem with an LC II and a accelerator installed? If so, any known workarounds?
 

ScutBoy

Administrator
Staff member
Founder
Sep 2, 2021
337
316
63
Northfield, MN USA
Accelerators and sound don't always play well together. In the old times there was usually a control panel or init that would modify the sound code to get the timing correct. Don't know if such a thing is necessary for this particular accelerator.
 

jasa1063

New Tinkerer
May 30, 2022
40
24
8
The response I got back from MacEffects was that the issue is most likely due to issues with the sound chip at UB10. I checked that area with a 30x loupe and did not see any corrosion. They offered me a replacement accelerator or a refund, but I think it is something with the logic board at this point. If I power up the Mac LC II and the power it off an on again the sound is Ok. I can do any number of power cycles in succession after that and the sound is fine. Let it sit for 5 minutes and the issue comes back. I am just going to keep the accelerator and dig a little deeper with LC II logic board.