[sdiy] Re: [AH] Matrix FX first sound demo

[JH.]

http://jhaible.heim.at/matrix_fx/matrix_fx_demo_1.mp3

> Sounds good! No surprise, there.

Thank you!

>Are the formant-like sounds during the first 2 minutes (and later)
>created by the wavefolder? Or hard synced oscillators?

That's (as far as I rememeber - I'v un-patched it last night after the demo) 
a single oscillator (Osc. 2) droning on G, feeding the VCF which is 
modulated by Osc. 3 in Random (S&H) mode (sync'ed to the trapezoid).
Filter output goes to the Phaser, which feeds the main stereo outout (ch 1 
panned left, ch. 2 panned right). The Phaser is initially set to the "thin 
Stereo" mode (two independent 6-pole phasers like the Mutron BiPhase, but 
with inverted feedback and inverted mixing), and is later switched to other 
phaser modes (Moog 12-pole and Compact A 8-pole).

The wavefolder is only used on the organ. There is this very thin and cheezy 
short organ melody, which then becomes thick and distorted when the wave 
folder is switched in. Also, some of the very short organ notes that deed 
the BBD delay later, are processed with the wavefolder. Towards the end, 
when the Osc2/Filter/Phaser string produces these bubbling noises, a thin 
organ is processed with the BBD like a flanger, with manual (knob adjusting) 
modulation.

>Or what? Do
>the VCOs have sync inputs? I don't see mention of that feature.

No. Only Osc 3 can be sync'ed to the Trapezoid, and only when it's in S&H 
mode. This is to get the S&H clock following the beat of any Envelope/VCA 
treatment of internal or external signals.

>Also: You've posted a lot of photos, so I hate to ask, but it would
>be nice to see a close-up or a diagram of the pin matrix.

I may be adding more photos later. But for the matrix layout, you might also 
find the construction drawing useful: 
http://jhaible.heim.at/matrix_fx/jh_matrix_fx_fpd_testprint.pdf
It's a pdf, so everything should be readable when you zoom in.

JH.