TetoricaFM2612Analyzer

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Playback and analysis have different coverage. “—” means the feature is not currently available. This list describes implemented features, not a guarantee for every track or chip combination.

• Seek cache: speeds up seeking by restoring a saved playback position and replaying only the remaining interval. Available for OPN (YM2203 / YM2608 / YM2610 / YM2610B), Genesis configurations (YM2612 / Sega PSG / RF5C164 / 32X PWM), YM2151 / YM2164 with optional Sega PSG / Sega PCM / OKIM6258, Game Boy DMG, and NES APU with optional FDS (NTSC). Every active chip must support restoration. Genesis or OPN mixed with OKIM6258, standalone Sega PCM / OKIM6258, and rows without a Seek cache label use normal seeking. Previously visited positions may be faster while their checkpoints remain cached; uncached sections still need replay. Changing the track, ROM or playback settings can invalidate the cache.
• YM2164 (OPP): selected by the VGM YM2151 clock field's bit 31. Shares the OPM analysis/export path; Timer B runs at half the YM2151 rate. Undocumented registers 0x00–0x07 are not emulated specially. Mixing with MSX AY / OPLL / Y8950 / SCC / SCC+ is supported. A second OPM/OPP chip is not supported. Playback, seeking, Timer B and note/voice extraction are covered by synthetic VGM tests; real SFG tracks have not yet been verified.
• S98: one YM2203, YM2608 or YM2612 device. Compressed S98 and multiple devices are not supported.
• SPC: accurate snes_spc CPU/DSP core. Tag length and fade are used; untagged files default to 180 seconds, with a one-hour transport limit. Note-ish and Sheet Music share background interval analysis and BRR fundamental estimates; uncertain samples use provisional C4. Reference corrections apply to displays and MIDI / MusicXML / LilyPond, never SPC playback. Only the completed analyzed interval is exported. MIDI retains timing and pitch bends; scores use semitone pitches, a 1/16 grid and assumed 4/4 with adjustable BPM. Noise has no note; pitch modulation shows its base pitch. Audible envelopes, release, echo and later held-sample RAM edits are not transcribed. Raw BRR previews omit DSP envelopes and echo. Host transfers, complete IPL ROM requirements, and real-game compatibility need individual verification. No game data or Nintendo IPL ROM is bundled.
• MSX mix: YM2151 / YM2164 + Y8950 + AY + YM2413 + K051649 / K052539 (SCC / SCC+) playback, per-chip/channel controls, Live / Song Note-ish and MIDI / MusicXML / LilyPond export. AY noise, Y8950 ADPCM/rhythm/CSM and OPLL rhythm other than Bass Drum are omitted. SCC uses waveform repeat pitch; constant waves, halted periods and test frequency modes are omitted. More than 15 melodic tracks require multi-port MIDI playback. OPM/OPP noise, partial key masks and CSM are omitted. MSX mixtures use normal seeking; mixed voice export and Operator Info are not available. When OPM/OPP is present, its FM-only MXDRV MML / MDX export is available. A second instance of any chip and mixtures with YMF278B (OPL4) are not supported.
• PCM / ADPCM sheet music: SPC BRR base-pitch transcription is experimental; other sample-based parts remain TODO. Playback pitch alone does not determine the note name: the original sample's reference pitch must also be known or estimated. Drums and sound effects may have no definite pitch.
• Sample memory: some YMF278B tracks need an imported yrw801.rom (2 MiB). YM2608 rhythm playback uses the ADPCM-A ROM. YM2610 ADPCM uses the VGM's embedded ROM data. OKIM6258 needs no external sample ROM.
• OKIM6295: uses embedded VGM ROM blocks (0x8B). Second instances and DAC stream destinations are not supported. YM2151 and YM3812 mixing is tested with synthetic ROM data and the real FM core; commercial game tracks have not been audited. OKIM6295 mixtures use normal seeking, without snapshots.
• OKIM6258: 3-bit ADPCM, recording and a second instance are not supported. YM2151 mixing is covered by synthetic tests with real cores.
• Sega PCM: an arcade chip (OutRun, Space Harrier, System 16/18/24, ...), not a stock Genesis/Mega Drive cartridge chip. ROM bank shift/mask come from the VGM header's interface register. Mixes with Sega PSG and/or YM2151 (e.g. OutRun). A second instance is not supported.
• WonderSwan: single-chip playback supports wavetable RAM writes and Voice PCM / sweep / noise. Note-ish and score exports infer only the written wavetable base frequency; CH2 Voice PCM, CH3 sweep and CH4 noise intervals are omitted. Waveform harmonics and RAM rewriting are not inferred. Wave RAM snapshots can be graphed, auditioned and exported as JSON / code / WAV. Timed Voice PCM captures preserve byte timing and hardware routing, split into at most 10-second windows, with JSON / WAV export. Unplayed RAM candidates are separate. Instrument editing is unavailable. Seeking replays from the beginning; no checkpoint cache. Hyper Voice / DMA and dual-chip / variant files are unsupported.
• Game Boy DMG: not mixed with any other chip yet. The DMG wave-RAM corruption glitch (retriggering channel 3 at an exact bad moment) is not reproduced. Note-ish/MIDI/LilyPond are write-driven approximations: length-counter timeout and channel 1 frequency sweep are time-based and not reconstructed from register writes.
• Note-ish / MIDI / MML: estimated base pitches and key intervals; PCM/drums and all modulation are not transcribed. MML uses a sixteenth-note grid. OPN exports target MUCOM88 / OPNAvoid; YM2151 / YM2164 targets MXDRV MML or compiled FM-only MDX. MDX has no PDX; noise, partial keys, CSM, live register changes, pan and LFO are not replayed.
• DAC streams: first-instance YM2612, Sega PSG, PWM, OKIM6258, HuC6280 and WonderSwan destinations are supported. Other destinations are warned about and omitted.
• All / Snapshot: All collects voices across the track; Snapshot captures the current channel states. Unsupported chips and features can leave parts of a track silent; check the playback warning area.