Module is available as a DIY project only.
No info about availability.
A DIY expander module for the Livewire Electronics Audio Frequency Generator
With this you can select between all the waveform selections for the Antimatter which are usually only available via jumpers on the pcb.
It's a re-purposed 4ms RCD expander module.
A very rough and ready video can be found here:
These merchants probably sell this module. Huh?