What are some alternatives?
When comparing EarTrumpet and SteerMouse, you can also consider the following products
Volume2 - Volume2 is an advanced Windows audio mixer, a complete replacement for the standard Volume Control.
ControllerMate - Dec 2, 2017 - ControllerMate building blocks are triggered by controls on devices or MIDI messages. Each type of building block performs a small task. Building blocks can be combined to perform complex functions.
Power mixer - Power Mixer is a complete Windows volume control replacement.
X-Mouse Button Control - XMouse Button Control (XMBC) allows you to create application and window specific profiles.
Volumouse - From authors website:
Key Manager - ATNSOFT Key Manager, Key Remapper, Text Paster