Hello, I am planning on building a simple 5 octave hybrid analogue synthesiser, which is controlled via MIDI. My question is in regards to the exponential conversion required to control the VCO. my original plan was to use a microcontroller to DAC to then a pair of matching transistors to convert a linear voltage to expo current. However, would it be possible to avoid using a exponential converter and instead include this in the microcontroller? Would it be capable of accurately supplying accurate exponential currents capable of 5 octaves. I know that the octave range would be limited by the voltage by some microcontrollers use 5v supply. If so, could anyone share their opinion on how this could be achieved, in terms of code and circuitry. Thanks : )