4600/5600 synth: any know more?

[Prof. Antonio Guerrieri]

	Hi All,

	Someone wrote:

>I'm amused at all the excitement about the 5600.  I downloaded the 4600
>docs yesterday and saw how strange some of the circuits are in this synth.
>(7 and 14 volt rails? Huh?)
>
>The idea behind the transient generator is really good, combining an EG
>with a VCA to provide different types of responses.  Maybe there's a way to
>update this design to work with a more standard +/-15V.
>
>R>

	Incidentally, I'm trying to build up a 4600/5600 synthesizer and,
sorry, I do not think that an electronic device can be just judged by the
power supply rails!!

	At the moment, I have just done some little modules so I am not
able to give you a critical rewiew of such a synth. However, discussing
about with other  related mailing list people, the following appears:

- VCO/EG/Mixer/Transient (i.e. ADSR): good;
- Noise generator: interesting, it is digital !!;
- VCF: probably, the more interesting from the circuital point of view but
also probably a not nice filter (just 12 dB, no CV control of resonance,
etc.);
- Keyboard module: the analog one (4600) requires a further little module
which corrects some faults/ the digital one (5600) SEEMS ok.

	If any know more, I would like to read more critical issues about
this synth.

	Best regards,

	Antonio