Ports

The IO helpers for declaring a device's plugs.

Ports are declared in describe with m.addPort(...). A device may declare any number of each kind.

Helper	Handle	Kind
`audioIn(label, channels)`	`audio-in`	Audio input
`sidechainIn(label, channels)`	`audio-in-sidechain`	Sidechain input
`audioOut(label, channels)`	`audio-out`	Audio output
`midiIn(label)`	`midi-in`	MIDI input
`midiOut(label)`	`midi-out`	MIDI output
`modulationOut(label)`	`modulation-out`, then `modulation-out-1`, ...	Modulation source (up to 8 per node)

m.addPort(audioIn("In", 2));
m.addPort(sidechainIn("SC", 2));
m.addPort(audioOut("Out", 2));
m.addPort(midiOut("MIDI"));

The host builds the buses and wire handles from the manifest, exactly like a plugin's dynamic buses, so the ports just route.

Reading and writing

Audio: ctx.input(ch, i) and ctx.output(ch, i, v). A sidechain's channels follow the main input's. Loop over ctx.inChannels().
MIDI: ctx.midiInCount() / ctx.midiInByte(...) to read, ctx.emitMidi(...) to send. See the device API.
Modulation: ctx.modOut(i, value) writes the primary modulation output; ctx.modOutAt(out, i, value) writes output out (declaration order, 0 = the primary) on a multi-output device. See Be a modulation source.