Ok! I assume you have not read through the stickies on how to install applications without using the MPKG/PKG/LIN installers.
Here is the deal,
1. You 've to copy the folder rockbox [containing rockbox and system folders] into your .system/QT Download folder.
2. Open the Java folder and locate the CardRegistry file and open it with any Wordpad / Notepad++ / TextPad / Crimson editor / etc. DO NOT USE NOTEPAD. It will not open correctly.
3. Create a backup of this file somewhere safe.
4. Clone the registry entry for an existing application for this one. The entry starts with a Hex value enclosed within square brackets [] and ends with the property "Visible"
5. Update the values for AppID, Directory, BigIcon, Exec, etc to point to your new folder / executable.
5.a. AppID is unique value, so choose a value that is already not there in the card registry. It is a Hex value, I would advice converting the value to integer using Windows calculator, add 4 or some other num to it and convert it back to Hex and put it there. Remember the value should be same in the starting line enclosed in [ ] and the AppID property.
6. Save the file, close it, and reset/restart the phone. you should see the app in the app launcher.
Hope this is simple enough for you to follow. This page for more info on the registry entry
here.
If you are not confident about doing this, then do it the easy way. Install Rockbox from your previous source. Then replace the rockbox folder as said in step 1 above. Copy the equalizers in the path highlighted in the first post. Reset /Restart your phone and enjoy...