Model: Syntovox 221
Bands: 20
Retail price 6000 Euro
Produced: ?
Size: 4 HE
Features: High end model with noise & VCO, matrix panel, voiced & unvoiced inputs, attenuator per channel.
Expander 1220
The 1220 vocoder expander unit pictured above this 221 is a one-off piece Synton built for Dutch broadcasting company NOS. It houses a pitch to voltage converter, CV freeze function and a ‘presto-patch’ edge connector for making analyzer-synthesizer patches.
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syntovox 221 Manual, Review 221 sono france
VCO 221 schematics, 221 PSU schematics 221,_input schematics 221, Vocoder output mixer,
Only a small amount of these were made. Users include Wendy Carlos (who owns a 221 & SPX 216), Bruno Spoerri, various electronic studio’s in Europe. Best suited for studio use due to complex control.
The 221 has a 50-pin connector on the back which provides CV in and out for each channel, and other functions.
221 block diagram
A spectrogram of the 20 filters, spaced in minor thirds.The four bands per octave create a diminished chord.
The sample below is a polysynth chord on carrier, a S&H sine on the speech input.
One channel is without voiced/unvoiced detection, the other switches to internal noise on unvoiced sounds.
The left and right sounds are recorded in different passes.