In the period of 1989 to 1993,
[10] Robin Whittle of Real World Interfaces
[11] offered
aftermarket modifications to the MT-32 to address its sound quality issues, as well as improve the functionality of the reverberation unit, provide discrete analog outputs for the internal reverb send and reverb return, and provide battery backup of the MT-32's settings.
[7]
According to documentation written in 1990,
[7] these modifications were only available for the first-generation MT-32, and not the later "headphone" model or any of the other MT-32 derivatives.