classic synths?

[ian-s]

Hi all

Not sure about the category for these ones, does classic imply moog, arp, prophet 5 etc?

This one is not meant to duplicate the architecture of the minimoog, just capture some of the character. The only things I need to explain are the imperfection circuits. The first one uses two D type flip-flops to detect the beating between oscillator pairs. The output of the flip-flops and some gated combinations are mixed into the fm input in a feedback configuration. This is supposed to emulate the 'bus noise phase locking' of the minimoog oscillator bank. It does help 'loosen' the sound in a way that differs from applying purely random deviations. The second circuit is a lot simpler and just makes the other two oscillators go sharp higher up the keyboard. This is because analogue vco's normally create a basic sawtooth wave by integrating the current from an exponential converter in a capacitor. When the voltage at the output reaches max, a brief pulse discharges the capacitor and the cycle repeats. The discharge pulse period is constant and very fast, insignificant at low frequencies, its effect on pitch is more pronounced the higher you go because it represents a larger percentage of the total cycle. Although the mini has a high freq trim for each oscillator, it's generally accepted that it is always a bit sharp up top.
The overdrive module is expensive in terms of dsp usage but I think it is required despite Rob's (very elegant) warmth trick in the mixer. Any more than a little overdrive however and it starts to sound like an MS-20

Speaking of Korg, the next patch is just a quickie to illustrate how the FltPhase can be used as a very steep bandpass filter. The first variation is the 'pitched noise' from a Korg 700 (minikorg).
Does anyone know if this is similar to Roland's new 'sideband filter' effect?

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mininew.pch2
Description:	minimoogish	Download
Filename:	mininew.pch2
Filesize:	1.75 KB
Downloaded:	2257 Time(s)

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PitchedNoise.pch2
Description:		Download
Filename:	PitchedNoise.pch2
Filesize:	1.13 KB
Downloaded:	2048 Time(s)

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[Sander_k]

[egw]

I've learned never to say "impossible" when talking about the NM. Usually within a few hours someone will post a patch that does it.

[ian-s]

[Sander_k]