[sdiy] 909 hh sample selection

[Colin f]

> pins 12 and 13 of the 4520 start low (00) when the hh is 
> triggered,

Yep. The trigger line is connected to the RESET input on the counters.

> but 
> because of the OR diodes if the closed line is high, the 
> sample starts 
> playing from 11..., sounding the closed sample. right?

Right.
 
> forgive me if my terminology is wrong, i'm new to digital circuits.
> 
> so what i need to do is:
> -if i want all open, cut the closed line
> -if i want all closed, replace the closed line with +5v.
> -if i want to swap open and closed, i have to invert the closed line?

Yep. A 3-way switch and an inverter should do it.

Cheers,
Colin f