It seems you have a cynical edge to every post...I've been lurking around the Blaze forum for tips and all I have seen is you interjecting your opinion as gospel wherever you go.
Volume + does not work, along with several other apps...I have tried to no avail.
altering db levels has minimal effect with this phone. I imagine the audio processor clips at a certain level so regardless of the limit on the file, the internal amplifier will not allow beyond a certain level so you are pushing an overdriven input to a clipped output. I have yet to measure this, but can tell you that by adding +6db gain to an audio file, which essentially doubles the output power twice over it's existing level, the overall difference in output through the speaker is negligible where it should have been noticeable.
I imagine the changes must first take place in the phone software, which up until this point has not happened most likely due to the fact that no developers have these lesser phones.
A small lesson in decorum...advise as though you think you MAY be correct, not as though you are sure you are. Your advice MAY be far more welcomed.