No. The regular Arduino does not have a DAC. analogWrite() is PWM which can approximate analog to control the speed of a motor, dim an incandescent lamp, or to make an LED appear dim. There is a tmrPCM library and a PWM DAC library that can get audio using PWM. But those are not true-analog unless they are properly filtered and I don't think a simple RC filter will do it, and any remaining PWM that "leaks into" an amplifier can do bad things to the amp....
It's via analog mono mini jacks pure analog signal 0-5V to input to my symth so would I need to know impedance?
Couldn't I use the RF filter to skim the range down to 0-5V
Before I double down on this I wondered if there is an arduino available that does have analog outputs?
It is a simple matter to add a D/A converter on your Uno.
How do I go about adding a D/A convertor?