Suggestion:
Extend DDS1 with a new waveform scanning mode, streaming the custom waveforms stored on disk.
How:
Shift + DDS1 switched into alternative waveform position.
Details:
Activating mode will also copy ENV1 to be used for scanning through waveforms. A new copy of ENV1 can be set by re-activation. WAVE selector could be used to set the total number of waveforms to scan (up to 32).