To Address Steve's request, I think we should put together a use case test that we can all follow to test our Tyros. Then report results back to Steve for him to either ignore/report back to Yamaha.

A use case would go as follows:

1. Plug in a Shure SM58 with XLR --> 1/4 Jack adapter into Microphone Input of the Tyros.
2. Adjust Microphone input gain on back of Tyros to 50% (halfway point).
3. Adjust microphone output volume next to power button to 3/4 volume.
4. In Mixer, adjust Microhpone gain to 90%
5. Adjust EQ settings for Microphone to Mid-Point or FLAT.
6. Turn on Vocal Harmony button.
7. In Mic settings, ensure Effects selected is HALL.
8. Turn on Microphone Effects button.
9. Select "MixAcapQuar" Vocal Harmony setting
10. Place Microphone 1" (2.54cm) from mouth
11. Turn on "Acmp" button
12. Play a Cmaj Chord and Sing into the Microphone.
13. Note any or lack of distortion.
14. proceed back to step 8, but Turn OFF Effects button and repeat steps 10 through 12.
15. Repeat steps 9 through 12 with different
effects types.

Post results on this forum.