I feel it could be interesting to have some sort of single-delay unit which takes audio input and then outputs the same audio after a whatever-millisecond delay. It could do for some fun effects, as well as for a very basic echo-unit.
Another DSP-unit I’ve given some thought would be a – perhaps rather unstable – “reroute and decay”-effect: reroute the audio to send track this-or-that, and decrease the volume by x-percent until the audio signal is below a specific value.
