DEIF controllers test station setup

I would to build an adjustable 3-phase system operating between 45 Hz and 65 Hz, you are essentially designing a low-frequency variable frequency drive (VFD) signal generator rather than a standard entertainment audio amplifier.
‎Because precision phase shifting is difficult to maintain using analog resistors and capacitors across an adjustable frequency range, the most reliable approach is digital generation using a microcontroller, followed by clean analog amplification.

I need help on where to start.

I want to set up a test station for synchronisation and testing of DEIF controllers.

Any assistance will be highly appreciated.