Volume reduced when battery disconnected

[tom-t-rifik]

Found a wierd thing this weekend after disconnecting the battery to install a K&N FIPK kit.

When we reconnected the battery and let the car go through reset cycle for PCM, everything went fine, but I thought the radio had gone out.

I now have to turn the volume up to level 19 or 20 to get the same sound level that I used to get at 10-12? Is this normal? Should I turn volume down to 0 or turn the radio-off completely then disconnect the battery again so it will reset properly?

Suggestions? Ideas?[:I]