some math for you:
toneports maximum recording ability is 24 bit/48 khz (yes, there is a 96khz mode, but its fake. it just upsamples a lower-res recording)
so, you have 24 bits recorded 48000 times in 1 second. that makes 1.152.000 bits every second. put a few extra bits for error checking and coorection, you get a 1,2 Mbit data flow (BITS not BYTES, its different

)
now, let's check the speed of a standard USB 1.1. minimum speed: 1,5 Mbit/s - maximum speed: 12 Mbit/s
well, i guess the minimum usb 1.1 speed is HIGHLY enough to run the toneworks at best.
so, your answer is: toneworks does not use full usb2 speed because it doesn't need to. its fully operational at minimum usb 1.1 speed.