I went to the app store for volume+ bought it, but it was only version 1.0.8.5. When I contacted Daniel the developer here is instuctions

Download and install an app called "Download All Files" from the market.
On your phone go to Settings > Application Settings and tick 'Unknown Sources'.
Browse to the downloads section on my website from your phone and download the app (
Once it's downloaded, click on it in the pull-down status bar and it should install!
The file will be in Download I think that is it
PS I have Nexus S

Lou