Left ear, right ear
Tone Split is a small stereo synthesizer for hearing how pitch, timbre, level and space work on each other. Stack oscillators or load a chord, then move one voice and watch both channels answer.
Web, iOS and Android · best in headphones
Oscillator
Voice rack
An oscillator carries a frequency from 20 Hz to 2 kHz, one of four waveforms, its own level, and its own place between hard left and hard right. Nothing is grouped and nothing is linked: mute one voice and it leaves the display while the rest carry on.
The library holds 93 voicings, and picking one adds it as that many separate oscillators. The moment it lands there is nothing chord-shaped left about it — detune the third by two hertz, push the seventh hard right, mute the root and listen to what is underneath.
Left channel above the line, right channel below. A voice panned left draws only in the top half, panned right only in the bottom, and a centred one draws in both — because that is where it is actually going. The height of each line is that voice's level.
Turn it, or type it
The dials are for the part of this that is listening — grab one, move it, hear the beat speed up or the field widen. When you want an exact figure instead, one tap swaps every dial for a number field with its range beside it, so 111 Hz is 111 Hz and not nearly.
Frequency is bounded to 20—2000 Hz, level to 0—1, pan to hard left through hard right. The library is equal temperament off A440, so Amin7 arrives as four oscillators at 440.00 Hz, 523.25 Hz, 659.26 Hz, 783.99 Hz — and from there they are voices like any other.
CHORD LIBRARY
Load a voicing
93 presets · tap to add
VALUES MODE
Type the number
Oscillator 01 · every field bounded
A figure outside the range is clamped to it, never rejected.
Two tones.
One beat.
108 and 111 Hz on the left. 114 and 117 on the right.