#
opll
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Library for Yamaha YM2413 sound synthesizer
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Updated
Oct 29, 2023 - C++
Frequency register map of the Yamaha YM2420, the OPLL variant found in the PSS-140/PSS-160 keyboards. Verified on hardware. The BLOCK field moves from $20-$28 into $10-$18 which the usual one-line summary does not say.
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Updated
Sep 7, 2026
Yamaha PSS-270 mod: an Arduino Mega + ESP8266 takes over the YM2413 FM chip and the keys. MIDI in/out, arpeggiator, key menu, live FM tone editor with draggable envelopes, WiFi updates.
arduino esp8266 midi synthesizer chiptune yamaha arduino-mega opll fm-synthesis circuit-bending ym2413 synth-diy diy-electronics fm-synth synth-mod pss-270 pss270 portasound yamaha-pss keyboard-mod
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Updated
Nov 6, 2026 - C++
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