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| Re: OT - AKAI AX73 Keyboard [message #101933 is a reply to message #101923] |
Mon, 05 January 2009 21:56  |
Jamie K
Messages: 1115
Registered: July 2006
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Senior Member |
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Based on the description at sonicstate, it seems like it uses a fairly
simple subtractive synth architecture:
From http://www.sonicstate.com/synth/akai_ax73.cfm
"The Akai AX73 is practically a MX73 master keyboard (minus some
controller features) added with 6 voice polyphonic analog synth. I
believe VX90 has exactly the same sound generating circuitry, which is
based on Curtis CEM3394 chips (the same as in Sequential's Six-Trak and
Max).
The voice is pretty basic, we have 1 VCO, VCF, 2 ADSR's 1 LFO and 1 VCA
per voice. There are some interesting parts, though. The VCO's have
triangle, sawtooth, variable pulse (with PWM) and a composite waveform
of saw & triangle. The PWM actually works with any of the waveforms, not
just pulse, which provides a little more sonic variability. The VCF is a
24dB/octave resonant lowpass and self- oscillates quite nicely. Keyboard
tracking goes well beyond 100%. The VCO can modulate VCF which is great
for ring-mod efects and suchlike. VCF cutoff can be modulated by bender
and keyboard velocity, which is one of the best features in the synth.
There's also a non-time-variable highpass filter in series with the
lowpass filter, which is nice. The two envelopes can modulate VCF, VCA
and/or VCO pitch. The lone global LFO is shared by all voices, but has
plenty of waveforms, including triangle, up/down saw, pulse and random
(sample&hold). There's also a built-in 2-position chorus effect, which
is pretty noisy.
Keyboard assing modes include poly, dual and unison, with 1, 3, and 6
oscillators per note, respectively. Adjustable portamento is available
in any of these, but it's always monophonic."
End quote
So you could probably create a similar patch with any soft synths that
include a suitable subtractive synth architecture, such as Zebra, Pro53,
Reaktor, Massive, ES2, ESX24, the Arturia synths, etc. All these and
more, while not directly emulating the AX73, offer a superset of what
the AX73 does.
Cheers,
-Jamie
www.JamieKruz.com
Stephen Stecyk wrote:
> Just curious if anybody knows of a soft synth out there that emulates
> this particular keyboard. Threre's a patch that I would like to use,
> but the volume slider is dirty, and no mater how much I've attempt to
> clean it, it adds a "scratchy" background sound, which I obviously do
> not want.
>
> Thanks a bunch!
>
> Stephen
>
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