I think PowerTracks (and RealBand) only allow reading of Multi-Track WAV files, but not saving back as Multi-Track WAV.

The user's manual shows this:

Quote:

MultiTracks Wave File Player

This command will play special MultiTracks wave files (up to 48 tracks). This file format is similar to regular wave files, but instead of being simple stereo or mono standard wave files these files can be quite large and contain up to 48 discrete mono tracks.

The dedicated MultiTrack Wave dialog is simply a quick means of playing these special wave files. This player can also play and preview any regular mono or stereo wave files.

To use, note the following:
1. Use the Load button to load a file.
2. Use the Play and Stop buttons to start and stop playback.
3. The Time Scrollbar lets you adjust the current time location.
4. The Import button offers the ability to import a wave or waves into new projects – provided the sampling rate and resolution of the file is supported by or can be converted by RealBand. Otherwise, the import button will be disabled (grayed out).


John

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