Applies to: Vocaster One & Vocaster Two.
Vocaster One and Vocaster Two operate at 48kHz - it is not possible to set either of these devices to any other sample rate. The primary reason for this is the Bluetooth connectivity feature on Vocaster Two - this is fixed to 48kHz.
Whilst this may seem like a limitation, it should be noted that some audio recording applications that claim to only support recording at 44.1kHz include Sample Rate Conversion, meaning you can use Vocaster with these applications without issue. (GarageBand, Hindenburg, and SquadCast are some examples of this).
Of course, if your audio recording software supports a range of sample rates, we would advise selecting 48kHz where possible.