The controls for the Vox Bassmaster are as follows:
 Master tone
 Master volume
 Bridge pickup (Vox V1)
 Neck pickup (Vox V1)
British built (JMI) Vox Bassmaster basses were fairly widely available, and along with the Vox Clubman bass made up the majority of UK Vox bass sales. Many UK bass players started out on these instruments; the Bassmaster was cheap, short scale, with a very thin neck, ideal for guitarists swapping to the bass, or just players with smaller hands. The price was also kept low by only employing the simplest of electronics: master volume  and master tone . The two pickups [3-4] are identical, and it is not possible to select either pickup individually.
But a good sounding bass none-the-less, very bright sounding - I prefer it with the tone backed off a bit. Listen to the sound clips below.