Tetorica Sound Laboratory

NES APU + FDS

Tetorica 2A03 Synth

Explore the sound. Draw a wave. Take the code.

APU NES APU + FDS

Output options

Software smoothing connects key edges over 5 ms to soften DAC clicks. Held tones and hardware envelopes stay unchanged. Off gives raw output; this setting is not saved in presets.

Enable audio, then play the keyboard. Editing does not start audio.

Waveform / Spectrum

Live output after Master volume.

Sounds from VGM

Choose an NES / FDS VGM, then select a sound to play.

Imports initial sound settings and recorded DMC samples. Later changes, length counters and song playback are not replayed. Incomplete sample RAM and direct DAC PCM cannot be recovered as DPCM. Any approximations are shown with the selected sound.

Sound source

Pulse · 2 voices · round robin

Hardware now

Live chip values

Instrument files

Keyboard

Every key plays the selected source.
Octave 4

When full, the oldest note is replaced.

One NTSC NES APU + FDS: two Pulse voices, one Triangle, one Noise, one DMC sample and one FDS voice. Round robin, Pitch bend, waveform drawing and preset files are software performance tools. Song playback and audio-to-DPCM conversion are not included.

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