Yamaha DX200 Owner's Manual page 55

Select this window by clicking "Edit" on the menu bar, then selecting "DX7 Simulator ."
You can also call it up from the toolbar. Keep in mind that you can't directly do any edit-
ing from this window. However, you can do three things here:
1) Play the virtual keys --- and hear the connected DX200 sounds.
2) Open a new Pattern, or store a Pattern that you've been editing --- by
clicking on the virtual cartridge slot.
3) Click on the virtual panel controls --- and call up the Edit Panel win-
dow, for editing in the fashion of an actual DX7.
DX7 Simulator Window
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DX7 Simulator Window