A Note from the Tascam Team:

Please do not use Quicksound to convert your Instruments to Version 4.
Using the Quicksound standalone application to convert files from earlier versions to Version 4 has the potential to corrupt files. We will be removing the conversion options from the Quicksound application in future versions. There is no advantage to converting a legacy instrument into the new v4 format unless you intend to incorporate some of the new morphing filters or smart MIDI features. You can still safely convert single instruments from older versions to v4 by resaving them in the v4 Giga Editor if you wish to incorporate some of the newer features.

We apologize for this inconvenience...