Demos in previous posts here.
ARCADE via this auction
Sound synthesis through Frequency Modulation (FM) allows to obtain unique sounds that defined a whole musical generation during the 80's and 90's. The model ARCADE uses the YM2151 Yamaha chip that was used in almost all the arcade machines in those years.
What makes it special?
The YM2151 has eight channels with four operators per channel. The operators can interact according to eight different algorithms. Attack-Decay-Sustain-Release (ADSR) envelopes, frequencies and low frequency oscillators (LFOs) can be modified to obtain the whole range of FM sounds.