This one in via Martin Walker of Sound on Sound, who brought us the Yew Tree Magic's Steampunk Shruthi Sound Designer Edition.
"With additional top-mounted panel controls and handsome cherry hardwood side panels, the Retro Expansion is a heavily modded version of the Korg MS-20 Mini by Martin Walker that includes the following additional features:
1. MULTI-OUTPUTS: separate TRI, SAW and PULSE output sockets, all available simultaneously, plus a separate output for OSC2.
2. PWM: an additional input for OSC1 variable pulse width modulation, using the existing pulse width knob to control PWM level.3. SYNC: An OSC2 Sync toggle switch, to lock it with OSC1 for those screaming lead sync FX.
4. FM: An FM input added to OSC2 with its own rotary level control, so it could be modulated at audio rates by OSC1 among other options.
5. VCO MIXER: expansion for the existing mixer section, adding two extra input sockets, each with its own level control knob.
6. DIODE RING MOD: a more traditional transformer/schottky diode ring modulator circuit to achieve far more mellow ring mod options than the integral (XOR) option.
7. Final casework mods include a new top-mounting panel for all the new controls, a 1/4-inch jack output, and cherry hardwood side panels from Dolmage Designs.
If you're interested in adding any or all of these Retro Expansion mods to your own MS-20 Mini, all details of the circuit changes and more photos are available at www.yewtreemagic.co.uk. They should also work on the original MS-20 and more recent kit versions."
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