Hi again, Hans, I have changed the code to be more likely to yours but my controller is responsing very strange, I already read and rewrite code many times and cant find the faulty, everythings apears to be correct (maybe blindness or donkeyness), it keeps sending all values all time (never stop), can you help me, here is my code, thanks in advance.

READ0:  CALL READ           ; Read ADC (Result on A) 8bit
        MOV TH,A
        MOV TP,@R0          ; Remember previous value
        CLR C
        SUBB A,TP           ; Current - Previous
        MOV DIR,C
        JNC ABSEND          ; If carry: result was negative, CPL IT!
        CPL A
        INC A


ABSEND: CJNE A,#1,TRESADC   ; Compare change to deadzone
TRESADC:JC INCI             ; changed less than value. ignore
        
        MOV A,TH            ; remember current value
        
        JB DIR,addtres      ; If change is up, compensate down
        CLR C
        SUBB A,#1
        JMP SEND0
        
AddTres:ADD A,#1            ; If change is down, compensate up
        

SEND0:  MOV @R0,A           ; Update ram value with new one
        CALL SEND           ; send midi data
        
        
INCI: ;code continues - next input read