This initially extremely cruel sounding Bontempi sqeakbox would everybody else likely hated so much that he rather would throw it away or smash it with a sledge hammer than ever to dare to make a serious instrument of this ear tormenting tablehooter. But after modification it makes a great tekkno instrument because it as many freaky howling synth sounds with gritty stepping zipper noise envelopes.
The main voice sounds resemble coarse 2 operator FM timbres with complex envelopes those have audible zipper noise. All sounds contain a short sustain, which makes it impossible to play very short notes. Sounds with short attack phase start with a percussive click. Most wind instruments contain a delayed vibrato (often less extreme than with Bontempi B30). The "leslie organ" is a rough Hammond organ sound with strong, slow vibrato; the attack phase resembles more a steel drum. Also "brass" has a strong and the "crazy trumpet" an extreme vibrato. The "horn" fades duller. The "xilophone" is rather a vibraphone with strong vibrato, while the "vibes" has none (likely the manufacturer confused both names) and fades duller. The "vibraphone" is a duller version of "xilophone". The "jazz organ" is a plain dull Hammond timbre. The "piano" is rather an electric Rhodes one and fades duller. The "bandoneon" is a reedy tone that fades brighter. The "telephone" is a disharmonic digital phone with a little sustain. The "synth drum" howls down and up again an a unique way; this one has a shorter envelope than on Bontempi B30 and resembles a cat meow. The "ghost" is harsh hollow, halfway voice- like tone with very strong, howling vibrato and long sustain phase. The "fantasy 1" is a medium fast howling siren with a similar timbre, while "fantasy 2" is the same in faster and with sustain. (Unlike the B30, here siren sounds don't repeat their 2nd in the lowest keyboard octave.) With the "sustain" and "reverb" buttons the release phase of most timbres can be extended. The "reverb" adds an additional longer sustain with lower volume than the normal sustain to the envelope.
The digital volume control steals bit resolution from the main voice, which truncates the decay phase of the timbres at low volume and thus can be rather regarded as a sound effect. It anyway only affects the main voice and not the rest, which is not what a volume control is supposed to do.
Annoying is that the accompaniment of the rhythms plays always in a
fixed key and can not be turned off, which limits their use very much.
The accompaniment seems to be made from rough squarewave organ chords and
a monophonic e-bass sound. Unlike the Bontempi B30, this one has
no programmable drum pattern but the "sustain", "reverb" and "plus play"
buttons instead of drum sequencer buttons. Also annoying is that selecting
a new rhythm always switches the main voice sound to a default one corresponding
to that rhythm. (The B30 makes no such nonsense.)
A predecessor of this instrument was the Bontempi
B30, which has even a programmable drum pattern and different sounds,
but misses the (anyway quite useless) accompaniment. The similar Bontempi
B40 (stereo with accompaniment) and B20 (mono, only 15 sounds
and 7 rhythms) have no individual buttons but select everything through
keyboard keys (and a single "select" button instead of the white "power"
button). The top of the line model of this series was apparently the very
mysterious Bontempi
BS3000 mini synth.
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