Sub Tones are used by the S-330/550 to conserve memory. A Sub Tone allows you to share the same sample data between two different Tones. You can edit sample information on a Sub Tone without affecting the original Tone. Since Sub Tones read the waveform data of an original Tone, the original waveform must be in memory along with the Sub Tone. Use the following procedure to create a Sub Tone:

1. Load the desired Tone(s) into the S-330/550's memory (as described previously).
2. Highlight "MODE" and press the left mouse button.
3. Highlight "EDIT" and press the left mouse button.
4. Highlight "MENU" and press the left mouse button.
5. Highlight "Tone PRM" and press the left mouse button.
6. Highlight the currently selected Tone location (upper left of the display, under MODE) and use the left/right mouse buttons to select a blank Tone location.
7. Highlight "---" next to Original Tone and use the left/right mouse buttons to select the Tone whose waveform data you would like to use. That Tone number will appear next to "Sub" in the display. You have now created a Sub Tone. You can edit and place the Sub Tone in any Patch as long as the original Tone is in the memory of the S-330/550.
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