This Module is currently available.
Ring Modulator 151
M2Synth by Soundtronics
Another classic sound in synths is the ring modulation effect for which we have the Ring Modulator 151.
Features
Two modes of operation AxB where the output signal consists of the sum and the difference of the input frequencies. A second mode is 2A where the output signal is twice input A signal.
Bypass controls to mix the input signals with the ring modulated output signal
Specification
Supply voltage +/-15Vdc (Uses included in-line voltage regulator module with both MOTM and MU headers)
https://m2synth.com/Individual-Modules/MU-Format-Modules/MU-Effects/MU-Ring-Modulator-151