memory locations SID

[underboard]

using the cc64 on a vista pc. trying to program the SID with machine language. anyway,.. if i poke the values in basic i get noise and it works. if i try to enter the values thru machine language at the registers $d400-$d418 they wont take and stay zeros. also when the values are poked and sound is going, if u check the memory locations with m d400 they are still zeros!!!!
any programmers have luck with this cc64 sid memory locations?!
please help

[underboard]

nevermind, i got it

ldx
then
stx into your sid register

thank you me

[StevenRoy]

Yeah, the SID registers are write-only. This is normal. (Except for the Voice 3 envelope and oscillator outputs, which can be read but not written.)