Yamaha S70XS Owner's Manual page 54

Troubleshooting
Playback continues without stopping
 When the [ARP ON/OFF] button is turned on, press it so that its lamp is turned off.
 In Sequence Play Mode, press the [START/STOP] button.
 When the click (metronome) sound continues, hold down the [SHIFT] button and press the [START/STOP]
button to stop the sound.
The sound is distorted
 Are the effect settings appropriate?
Use of an effect at certain settings may produce distortion.
[VOICE]  [EDIT]  Effect
[PERFORM]  [EDIT]  Common  Effect
[MULTI/SEQ PLAY] (selecting Multi mode)  [EDIT]  Common  Effect
Use of the Master Effect at certain settings may produce distortion.
[UTILITY]  Voice  Master FX
[PERFORM]  [EDIT]  Common  Effect  Master
[MULTI/SEQ PLAY] (selecting Multi mode)  [EDIT]  Common  Effect  Master
 Are the filter settings appropriate?
Excessively high filter resonance settings can cause distortion.
[VOICE]  [EDIT]  Filter/EG
[PERFORM]  [EDIT]  Common  Filter/EG
[PERFORM]  [EDIT]  Part selection  Filter/EG
[MULTI/SEQ PLAY] (selecting Multi mode)  [EDIT]  Part selection  Filter/EG
 Are any of the following volume parameters set so high that clipping is occurring?
[UTILITY]  General  Volume
[UTILITY]  General  L&R Gain
[VOICE]  [EDIT]  Play Mode  Volume
[PERFORM]  [EDIT]  Common  Play Mode  Volume
[PERFORM]  [EDIT]  Part selection  Play Mode  Volume
[MULTI/SEQ PLAY] (selecting Multi mode)  [EDIT]  Part selection  Play Mode  Volume
Sound is cut off
 Is the entire sound (via your keyboard playback and Sequence playback) exceeding the maximum polyphony
of the synthesizer?
Only one note sounds at a time
 When this situation occurs, the Mono/Poly parameter in the current mode is set to "mono."
If you wish to play chords, set this parameter to "poly."
[VOICE]  [EDIT]  Play Mode  Mono/Poly
[PERFORM]  [EDIT]  Part selection  Play Mode  Mono/Poly
[MULTI/SEQ PLAY] (selecting Multi mode)  [EDIT]  Part selection  Play Mode  Mono/Poly
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S90 XS/S70 XS Owner's Manual