My PC don't recognizes the megadrum but before yes

[dmitri]

Changes in 20080530 version:

...
3. Added an option to connect a high impedance HiHat controller to 32 inputs version of MegaDrum. That required small changes to the schematics. You can see in the Analogue Board schematic for 32 inputs version that pin 2 of J1.1 (only in the first of two Analogue boards) can now be used as an input for HiHat pedal controllers with high impedance. There is a relevant setting in the menu for this: HiHat Pedal->AltIn

Note: it is a pin 3 in the latest schematic

Changes in 20080619 version:

1. LCD contrast is now controlled from firmware. No need for an LCD contrast pot any more! While in the menu where it shows:
<MegaDrum.info >
(c)D.Skachkov
pressing Up/Down or rotating the Up/Down encoder changes LCD contrast. See updated schematics for required changes - minus a pot, plus a resistor and a capacitor.

Without above quoted modifications it's not possible to use these new features. I really cannot do magic

[Synthex]

thanks but i've the v2.4 synthex board i don't know how make it.

You must remove the pot and add a 100nF capacitor on the PCB (between ground and the pin 3 of LCD connector).
And add a 1 Kohms resistor between the pin 3 and the pin 14 on LCD connector.

the HI inputs didn't change beacause is a hard work

Just use the pin 33 of the Atmega for Hi-Hat HI input (through a 100 ohms resistor).