Hi
CV out might be tricky, depending on your needs. The Arduino can only provide 0-5V so anything above that requires some sort of amplification and external power or DC/DC conversion. It can definitely be done, but for eight channels it becomes rather complex. For high quality signals external D/As are preferred, but for basic needs PWM would work with some filtering. The good thing with PWM is that you can amplify the voltage using a single transistor before the filtering, the bad thing is that modulation frequency (500Hz) harmonics will pollute the CV, affect response time, limited resolution (8bit) and possibly linearity…