sorry, I'd overlooked the fact that the Synthrotek version of the APC does have some 'CV' inputs. That's not the case in the 'pure' APC. From the schematics they seem to be connected to the CTRL and Threshold inputs of one timer of the 556.hivkorn wrote:for the Atari_Punk_Console_Kit , i don't really understand why there are CV if this inputs are not controlling the pitch !
Checking a reference page for the 555/556 tells you what those pins do
its even on t' Wikipedia:
So, yes voltage control of something, but not 1V/oct pitch by any means; glitchiness as ghettosynth says.CTRL Provides "control" access to the internal voltage divider (by default, 2/3 VCC).
THR The timing (OUT high) interval ends when the voltage at THR ("threshold") is greater than that at CTRL (2/3 VCC if CTRL is open).
Pin 5 is also sometimes called the CONTROL VOLTAGE pin. By applying a voltage to the CONTROL VOLTAGE input one can alter the timing characteristics of the device. In most applications, the CONTROL VOLTAGE input is not used. It is usual to connect a 10 nF capacitor between pin 5 and 0 V to prevent interference. The CONTROL VOLTAGE input can be used to build an astable multivibrator with a frequency-modulated output.
These are the kind of things you'll have to learn to work out for yourself if you're going to design anything btw.