Using any multitrack/sampler/looper and a simple sound source, the freqbox becomes a versatile cv recorder..
When this sinks in you realise that tremolos are lfos (with a ring modulator this gets very tasty).. Loop points and reversing samples can easily make rhythmical patterns.. Delays (especially dynamic/ducker delays) take on new significance..
No midi-cv required..
You can even patch the env out back into the freqbox for an audio controlled synth.. just add filter.. (id set the env amount and mix to 0/dry or things could get complicated)

A compressor allows you to change/record the depth of the control too.. attack/release can create rhythmical movement..
Depending on your setup you can expand on this idea in a lot of ways.. (A CP251 mult and attenuators/inverters are an instant starting point).
The more I use my FreqBox, the more I love it..