OPN-1

• OPN-1 runs accurate recreations of the Mega Drive's YM2612 FM chip and SN76489 PSG on the FM-1.
• You play the chips from the FM-1's own keys and knobs, or over MIDI.
• A library holds 128 FM patches in 4 banks of 32, stepped through with PRESETS.
• Single plays the selected patch with up to six notes at once.
• Layer stacks up to six patches, each with its own volume and triggered at the key, after a delay or on release.
• Split gives each MIDI channel its own patch for a sequencer.
• Knob pages edit the sound, each operator, the envelopes, LFO, vibrato, detune and arpeggiator, and SAVE keeps the patch in its slot.
• The web app fills the library from .opm banks or a game's VGM songs, exports banks, and streams whole songs to the FM-1.

Its modes

HOME

See the selected patch, its algorithm and the main sound knobs.

EDIT

Shape one operator at a time, shown large, then move to the next.

ENV

View all four operators' envelopes drawn together.

LFO

Set the LFO rate, its depths and which operators it moves.

FX

Set vibrato and a doubled detune.

ARP

Set up the arpeggiator.

GLO

Set velocity, bend range, MIDI mode and tuning, and the parts of a layer or split in SETUP.

SEQ

Watch every channel's note, level and patch in real time.