Using the Riffer AUv3 to randomize multiple rhythmic modulations at once
Combining Riffer and Drambo's voice selector module can give you a convenient UI to not only create random melodies but also multiple sample & hold style modulations by converting MIDI notes to pitches and using the pitches of individual voices to modulate just about any parameter you want. I've chosen the cutoff frequencies of two filters here. If you choose an appropriate scale in Riffer and in the Scale & Offset module, you could create random vowels for example.