Roland Super MPU64 + สาย USB + CD-ROM Driver Connect MIDI to USB. AKA UM-4 4-MIDI In, 4-MIDI Out MIDI Interface for USB Connector accommodates complex multi-track sequencing Bus power supply done not require an AC adapter Individual LED indicator for each MIDI In/Out port The driver (Supplied with the S-MPU64) features a Patch Bay function for controlling up to four S-MPU64 units at one time. (64 x 4 = 256 tracks) Single-space half-rack size can mount in one rack space. The S-MPU64 provides high performance in a small package. The overwhelming speed of the USB connection means instant response for multiple MIDI devices. Now, MAC drivers are also available in addition to the WIN98 drivers that come with the unit. Just click on thinkware.com to download them. Go to the product line section (no password required), click on the letter R, go to Roland and then click where it says support. Here you'll find the latest MAC and WIN98 drivers for all of Roland's USB and Canvas products.