Please try the free version first to see if it works.
Bass Booster Pro is a standalone app, so you should uninstall the free version to avoid conflicts.
The Pro features of Bass Booster include :
- Unlimited custom presets
- Homescreen widget (2x1)
- Homescreen shortcut (see below)
- Virtualizer
- Start on phone boot
- Preset auto-detection (see below)
- Automatic preset on incoming call/SMS or during phone conversations
- 4 themes
- Music visualizer
- Reverb (in Beta ! It doesn't work on most phones, so it might be removed)
- 20 built-in presets : More Basses, Improve quality, Electro, Techno, Dubstep, Dance, Pop, Rock, Metal, Reggae, Rap, R&B, Hip-Hop, Jazz, Latino, Acoustic, Classical, Party, Voice Boost, Volume Boost. (included in the free version)

Homescreen Shortcut :
This feature allows you to create a 1x1 homescreen shortcut that'll change Bass Booster settings in one click without even opening the app ! (see screenshots)

Preset auto-detection :
This feature allows presets to be automatically adjusted according to the music that is being played. Let's say that you're listening to some Alternative Rock music, by default, Bass Booster will automatically choose the Rock preset, but if you create a custom "Rock" preset, yours will be selected.
But it goes even further ! For example, you could create a "Punk Rock" preset and a "Hard Rock" preset and they would be automatically selected. (Android 2.3.3+)
You can also create a preset specifically for a song, album or artist and it will be auto-detected next time you play a matching song. This is very useful for volume normalization