A4 or AR

[Mies_van_der_Robot]

Meanwhile on the Rytm:

ZVUK Episode #2 - Analog Rytm Polyphonic FM

Yes, it already has extra LFO innit : dubdub : Analog Rytm Mk2 Free project incl

Plus tons more tips and ideas in Rytm tips and tricks - #194 by taro

Both of these machines are plenty deep for an experimental mind at play.