1. Don't expect a new revision of the CPS1.x multi. Sales have been OK but not enough to warrant a re-design.
2. We will just post here when the audio mod is ready for sale and I'll probably edit my dual crystal sales post to include both mods.
I can only respond to why a few of these weren't considered during multi production. For the audio and for the extra buttons the multi was designed to work exactly like the originals. It was my idea to add connectors to the filterboard so the original cps1 kicks could be extended to there...