Pro-One Bass Demo.mp3
Two pulse waves with PWM one octave apart.
Tweaked: Envelop Amount, Filter Resonance,
Filter Envelope Attack/Decay/Sustain, LFO Frequency (speed of the PWM).
Pro-One Sync Demo.mp3
Osc A is synchronized to by Osc B.
Both oscillators with pulse waveforms.
Tweaked: Osc A Frequency, Pulse Width of both oscillators via the modulation
matrix, Filter Resonance, Filter Cut-off.
Pro-One FM Demo.mp3
Two pulse waves. Osc B is modulating both
Osc A Frequency and Filter Cut-off via the modulation matrix. Tweaked:
modulation of Osc A Freq and Filter Cut-off,
Filter Cut-off, Filter Resonance, Noise Level.
Don't Go replica.mp3
All sounds made by the Pro-One including the drums, only reverb is added.
The lead and the "whrooau" sound is doubled to get really fat.
The Pro-One has been used on the two Unease songs "Absinthe"
and "Misled", listen at either Soundclick.com
patches are Unease' interpretations of the ones used by Vince Clarke in
the song "Don't Go":
Don't Go Bass.jpg
Don't Go Lead.jpg
Don't Go Arpeggio.jpg
Don't Go Whrooau.jpg
us and ask for Yazoo's "Only You" patches.
The images, mp3s and text on these pages may not be used anywhere else
without written permission.
Sequential Circuits Pro-One is by many held as one of the most powerful
sounding monosynths together with the MiniMoog and the Arp Odyssey. Although
most people think the MiniMoog is unrivalled when it comes to deep bass
sounds, the Pro-One is more versatile having a small modulation matrix
with two busses. With the modulation matrix the filter envelope, oscillator
B and/or the LFO can modulate oscillator A/B frequency, oscillator A/B
pulse width or filter cut-off. The modulation can be routed either direct
or via the modwheel. This may sound complex but is really straightforward
The Pro-One was brought out on the market as a scaled down and cheaper
version of the Prophet 5. The build quality is not in league with the
Prophet 5, lacking the beautiful woodwork etc of its big brother. Its
keyboard is notorious for its bad action and for being in constant need
of service. This is much worse with the later versions using the membrane
type keyboard. The membrane keyboard was used in the Pro-Ones with serial
number over 8500 and seems to be very hard to service. The small membranes
used as contacts for every key usually start producing double trigged
notes or lost notes when getting old. Most Pro-Ones however (roughly 10
000 were made) have the much better J-wire type keyboard. The J-wire keyboards
are pretty common in other synths and are pretty easy to fix when starting
to act strange. Another concern with many of the earliest Pro-Ones, serial
numbers under 1500, is that the power supply is mounted on the main board.
The weight of the power supply can damage the main board if the synth
is dropped etc. Many of the early ones were sent back to the factory for
a fix and the ones produced later have the power supply mounted on the
When I bought my Pro-One the pots were very noisy from oxide and its keyboard
was in pretty bad shape. I opened it up and cleaned the keyboard, fixed
the keys so they were at the same height and started turning the bad pots
back and forth to remove some oxide. Now it works very well with only
some noise from some pots that I don’t use that frequently. The
keyboard also works well even though it still feels very plastic and clicky.
The amplitude sustain pot is broken off, but it still works.
The sound of the Pro-One can be described as very raw and gritty but still
warm. The lead sounds often have a certain brassy quality to it. It’s
not as bass heavy as the Waldorf Pulse but capable of producing really
deep and solid bass. With some added EQ I think it is in the same league
as the Pulse. The oscillators sound very alive and with PWM they are really
massive! Comparing it to the Pulse again, it sounds so much more interesting
when fully opening up the filter. The oscillators sound more physical
and life full than the Pulse’s DCO:s. The filter can self-oscillate
and produce interesting seagull like sounds when on the edge. The envelopes
are well known for being extremely fast and snappy, which makes the Pro-One
ideal for percussive sounds.
the most famous user of the Pro-One is Vince Clark. He used it on Depeche
Mode’s first album “Speak and Spell” (1981), but it
was on the two album with Yazoo (1982-83) he really got the most out of
it. In particularly the first album “Upstairs at Eric’s”
the Pro-One dominates heavily with several songs solely made with the
Pro-One. At least the first single “Only You” is well known
to be an “all Pro-One song” since Vince published the patches
in the Electronics and Music Maker magazine. In fact you can replicate
most of the leads and bass sounds from this album with your Pro-One. Listen
to the short MP3 demo where I have copied the sounds from the other single
“Don’t Go”. On this page you will also find the patches
I have used. It should be mentioned that the drums probably were made
on another system [ARP 2600], other than that it is an all Pro-One song.
You may judge for your self.
Other Pro-One artist are Nitzer Ebb, Bronski Beat, Front Line Assembly,
Tangerine Dream and Die Krupps.
Read more: www.vintagesynth.org