Sequential Circuits Pro-One

Pro-One, Analog Synth from Sequential Circuits.

troust 08/06/2013

Sequential Circuits Pro-One : troust's user review

«  PRO-ONE, Mythical but fragile! »

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Features: Refer to section info Audiofanzine Pro-One, it is very well done and well explained.
In summary this is a mono analog 1981, mine has the serial number 7929, which means that the keyboard is good! (J-wire), knowing that the first models were equipped with up to 1500 a membrane keyboard.
This synth has a simple design but quite fragile construction.
A board on which all components are welded and all functions (pots, switches, connectors etc.).
This card is attached to a shell ABS screwed onto a metal base.
The whole is ornamented with two sides in thin wood.


As mentioned above, the configuration is simple, one button, one function as is usual on an analog of the time.
The English manual is very brief. But it is not necessary if one has mastered the use of this type of synth.
I appreciate the use of both VCO all completely independent, unlike other synths or VCO 1 is the master and the VCO 2 is align or not.
The waveforms can be combined (use a triangle with a sawtooth or square at the same time)
The utilsation filters is a treat.


I use it mostly in sequence, bass line sometimes in conjunction with my little Moog Rogue.
Another use: connect to an external sequencer (Roland CSQ100) it is interesting because we can combine the sequence of CSQ100 driving the Pro-One, with the internal arpeggiator Pro-One.
I sometimes block keys hold the Pro-One in order to modify a sequence.
Example: If you create a sequence of 24 notes on CSQ100 driving the Pro-One, you simply create an arpeggio of four notes on the Pro-One, and you get a new well synchronized sequence.
The ideal would be to create a short video to explain everything ....
This function is not between internal sequencer and arpeggiator Pro-One sets.
No Midi sync, it does not, so wav recording sequences for inclusion in the compositions.


I have since 1988, following an exchange with a sequencer ROLAND CSQ100, against my Korg MS20 and SQ10.
PRO-ONE is better at what I'm looking for is not very attracted by sound research and semi-modular patch type that is the MS20.
I keep my PRO-One until further notice you never know.
Commissioning still requires a good quarter of an hour wait before being fully exploited, stability VCO requires.
This is an old grandpa over 30 years.
When he arrived in my set of instruments after the exchange, the brave synth was operated fairly moderate, with relatively long periods of non-use. The keyboard does not know yet serious worries, bushings (kind of rubber damping pads each key) are still suitable
I wish to know its history from its former owner.