If I play the following 12800 long sample on GB sound channel 3... SineWaveSample: REPT 400 DB $8b,$df,$ff,$db,$84,$20,$00,$24 DB $8b,$df,$ff,$db,$84,$20,$00,$24 ENDR ... then I get the results that are shown in this 'gbsnd3.gif'. As can be seen from the gif, the top sine wave appears relatively normal but the lower wave has a weighted appearance depending on the sample values. The top wave has a small noise spike after reloading of wave RAM is complete but the bottom wave has a very large spike. This spike accounts for the very heavy buzz sound heard in these samples. During the 'sample reload period' when snd chnl 3 is disabled the effective value being output is 7 1/2. Also notice that the very first sample is identical to the last COMPLETE sample that was output before snd chnl 3 was turned off for reload. Due to these artifacts there is a tremendous amount of distortion on the sound playback on older GB full-size models and a smaller amount (but still significant) in all late model older full-size GBs, GB Pockets, and GB Colors units. It appears to me that snd chnl 3 was never designed for dynamic reload/updates in order to play raw audio samples due to the side-effects of doing that are described above. Jeff