The latest TONEBURST release is available.

There are a limited number of built instruments and PCBs for DIY.

https://toneburst.bandcamp.com/

The UM66 chip was designed to play popular monophonic
melodies: The chip used in this circuit plays several melodies.
The UM66 is used two times. They are not synchronised.
This DIY EMI has potentiometers to control voltage starve & volume as well as a switch to change the ‘bent’ character of the sound. It is possible to use headers sockets for the ICs to allow them to be swapped, enabling user control over the output.

This version was designed with a Winter celebration in mind, hence the name FESTIVUS as celebrated in regions of Europe and beyond. Nollaig na mBan! (little/women’s christmas Ireland) Trettondedag (13th day Sweden) día de los Reyes Magos (3 kings day Spain), also; Epiphany.

‘It’s the night the taxi drivers quiver in their boots’ Pauline – Cork

(Battery not included.)
These DIY EMIs require a 3v CR2032 battery for power.
The output is a mono mini jack (3.5mm).