Your old Game Boy can be reborn as an analog synth thanks to this incredible cartridge

Nanoloop - "a minimalistic electronic music program for handheld platforms" - makes sequencers and synths for old Nintendo devices, as well as iOS and Android apps. Nanoloop have been selling cartridges since 1999.

This new cartridge, the Nanoloop Mono, will allow you to turn your original Game Boys into analog synths (other models work as well but they don't sound quite so good). A description on Nanoloop's store explains more:

"On the original Game Boy models, one pin of the cartridge connector functions as audio input, connected to the built-in amplifier. This unique feature allows to generate sound on the cart and play it through the headphone output on a completely analog signal path.

"In the Nanoloop Mono cart, the analog components (op-amps, comparators, logic cells etc) of a PIC microcontroller are connected and configured in such a way that they form a hybrid soundchip with 3 analog filters and a true random noise generator, using only a few passive external components."

The Nanoloop Mono is has eight banks of flash memory - each can store 15 patterns per channel as well as a song structure.