To change a staff’s MIDI channel within a piece, you create an expression that’s been defined for playback as a MIDI channel number.

To change a MIDI channel in mid-staff

1. Click the Expression tool  .
2. Click on, above, or below the note to which you want to attach the channel-change expression. The Expression Selection dialog box appears.
3. Click Create. The Expression Designer dialog box appears.
4. Type the text for your Text Expression. You might want to call an expression that switches playback to channel 2 “To channel 2,” for example. To change the font, highlight the text, then from the Text menu, choose Font. If you want this marking to be invisible, don’t type anything at all.
5. Click the Playback tab. The playback options appear.
6. Choose Type > Channel. ENTER the channel number in the Set To Value box. Click OK or Select in each dialog box until you return to the document.

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