Bad pitch sequencer.

[hellmo]

Hi.
i ask you if you have any idea of where my problem is located, and if you have any solution. i verify a lot of solders, but can't find any mistakes.

the lowest note of my sequencer begin in A0, instead of C-1....when i play note G#0, it sounds very high, and when i play the next one, A0, it plays a very low note.

the range of the pitch is note "center" as it must be.

i'm lost with the schematics, i don't know what gives the initial pitch.....

thank you for any help.

[guest]

the pitch is set with ic9
and a0 is where the msb flips
check for shorts between nieghboring pins on ic9
and rehit the solder joints

if that doesnt work
check r74 through r90

you can also try replacing ic9

[hellmo]

Ok, tanks. IC9 was broken. A Fully working Xoxbox

[guest]

glad to hear its working