Why is the peak-to-peak voltage limited to 2 Vpp in MiM when the max output is 10 Vpp?
The Moku:Pro has a maximum output amplitude of 10 Vpp, this is true whether you are using Multi-instrument Mode (MiM) or not. However, in MiM the signal coming out of the Waveform Generator or Arbitrary Waveform Generator does not know whether it is being routed to another instrument slot or to the Moku:Pro output.
The maximum amplitude between instrument slots is 2 Vpp, so in the WG/AWG amplitude settings it is limited to 2 Vpp. However, when the signal is routed to the Moku:Pro output, the selected gain is applied before the signal is generated by the DAC.
This means that if you set a sinewave to 2 Vpp in the WG/AWG and route it to a Moku:Pro output with +14 dB gain selected, then the signal generated by the DAC will be a 10 Vpp sine wave. If a 0 dB gain is applied then a 2 Vpp sine wave will be generated.