Long story short, it’s a random looping sequencer. For a full description of the Turing Machine and its expanders, go to Music Thing Modular. The MkII version was introduced in 2016. I bought a full kit from Thonk. The PC board set I received is marked Revision 6, 2018. I skipped this module for a long time, just because of my low interest in sequencers. This has one non-quantized output. It needs an external clock to get going. The big knob lets you set the amount of randomness and at either extreme it locks in a sequence. This is under CV control, too.

I also built two of the extender modules, Pulses Mk II and the Vactrol Mix. I’ll describe those in a separate post. I would highly recommend getting the Pulses expander plus one or more of the Gate expanders. They add a lot of functionality and it’s nicely integrated.

Construction

The finished module is shown below without the front panel. There are two PC boards that connect together via three pin-and-socket header sets, and held firm by two metal standoffs.

The photo above shows the side of the board that ends up inside the sandwich.

The only part I changed was to substitute a keyed power header. GATES and PULSES headers are for connecting expanders. The expanders are powered from this board via these headers.

Notice the blue trim pot. There’s a hole in the front panel for adjusting it.

That’s the construction of the Turing Machine MkII. Next up: two expanders plus a recording of the ensemble in action.