I agree. I’m new to eurorack, however I made a list of possible fun rad small functions an arc + module could bring to the table.
A programmable matrix mixer would be so great.
A single VCO similar to the mini brute allowing you to change “volume” of each wave type set to each arc ring.
A buffered sampler in which each sample fills an arc’s ring (aprox. 3 seconds), where push+turn (“push” function on module, or arc if added. preferably on module as i personally didn’t love the push on arc.) changes how much of that sample is looped for playback and non-pushed turn changes speed of loop.
A handy quad LFO with arc visual feedback. Possible quantization to “bpm” for each LFO to create useful interesting patterns but where the LFO’s oscillation “slides” into place to create a seamless change in oscillation.
A separate “hold” button on module for each ring, where while hold is being pressed you can make changes to chosen ring and when released, it returns to perimeter last existed before the “hold”.
and finally, an option to “mute/unmute”, but not necessarily “pause” each ring from completing its function.