The sound modules were commonly used when computers had slower processors.
The MU-series product line superseded the company's previous TG-series modules, the TG100 and TG300.
Although the majority of Yamaha's MU-series modules were meant for the home user, the company also made rack-mount versions of the MU90 and MU100 called the MU90R and MU100R, respectively, for professional use.
MU50 and higher end models typically offer the following compatibility modes: The unit will automatically switch between XG and TG300B modes as required.
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