Via matrixsynth, where you can find more info and pictures.
“I recently picked up an old rhythm machine at an estate sale, It’s called a Percussionet 20, made by Barns and Mullins, London, England.
I think it may be rare because I could not come up with any info about this unit online anywhere, even tried Emailing Barns & Mullins twice, but they never responded.
Perhaps one of your readers may have some info about this oddity.
It will play all of the rhythm styles such as ( Fx – Foxtrot, Tw -Twist, Ch – Cha Cha, Tg- Tango etc.) at the same time, so you can combine various rhythms, also you can select and de-select the individual instruments in the rhythms such as: Snare, Tom Tom, Side, Bass, Bongo etc.
Rear has Hi and Lo output and ¼ ” footswitch input that starts and stops the rhythms.
Add some verb and delay or modulation effects and it sounds pretty incredable.
As usual, Charlotte the cat has her own thoughts about my Percussionet 20, see attached photos.”