Make sure you're using the 'User Defined Encoder' parameter passing scheme, command line options should be '--alt-preset voice %s %d' in your example.

Parameter expansion requires a bit of practice, but it can be very useful once you’ve become familiar with its many applications. Parameter expansion on a Linux system is a feature in the bash shell ...

The Linux command line is a text interface to your computer. Also known as shell, terminal, console, command prompts and many others, is a computer program intended to interpret commands. Allows users ...