[sdiy] Questions about the "Ray's Cool New LFO" and "sound mini-synth"..

[mathieu.vallet1 at free.fr]

Hi!

SO I have questions about the Ray's Cool New LFO
http://www.musicfromouterspace.com/analogsynth/coolnewlfo.html


-  How can I add a piezo trigger to activate sound when I touch?

I added 2 plate copper that I have solder to pin of TL084. One for change
frequency and the other to make gound on it.

-   I'd like to activate the sound when I touch the copper ?

In fact I use the plate copper when I put the frequency's pot at the extreme
left to have sub bass (the volum of bass is very low).

- The modulation doesn't work when I use plate copper, I have to raise the
frequency's pot, D o you know How I can I activate that??



Questions about the Sound Lab Mini-Synth :
http://www.musicfromouterspace.com/analogsynth/SOUNDLABMINISYNTH/soundlab.html

- Do I have to put metal resistor or carbon resistor, Is it sound differently??

- On the part list, there's a 1uf, 2uf ceramic resistor, but it doesn't exist on
this range, Is that sure that there are ceramic ??

- CA I add a piezo trigger to test the sound?



THANKS, if you take time to respond me.

bye!