I evaluate the product based on how well I am using and gradually assigning music modules. I previously wrote that connecting USB keyboards to USB ports and then using them in various music software, including Cubase, is without any problems. Now I have connected the Yamaha MU80 sound module to the ESI M4U eX via Cubase. I assigned the M-AUDIO Keystation Pro 88 keys to the sound module. The connection in the Yamaha MU80 was via the MIDI IN B port, and I connected MIDI port 5 to the ESI M4U eX, which was lit red. I had the ESI connected via the USB port to the PC and I also had the adapter turned on. Cubase integrated the Yamaha MU80. I assigned the M-AUDIO Keystation Pro 88 keys. I had left the keys in one zone without dividing the keys. I tried selecting voices via the keys - program-number of the selected voice. It went without any problems. The sound module always showed only the original 01 Grand piano, but Cubase worked with the selected voice. After trying several voice variations, I divided the keys into 4 zones and assigned a different voice to each zone. It worked. I had 4 different voices selected from the Yamaha MU80 sound module for each zone separately. I was happy with that.