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MP3 Volume issue was not a volume issue but the file was not actually playing.THe hardware interrupt on my mega is not working so I had to change it to a timer in the setup void. if (! musicPlayer.useInterrupt(VS1053_FILEPLAYER_PIN_INT)) // DREQ int
I got this mostly working on my Mega. 2 Issues i am having. 1) Using 1602 display with I2C adapter set at 0x27. I get blocks across the top and nothing else. I verified my I2C and display are working with a test sketch. 2) Finally got it to work with my seeed v1.3 mp3 board with the VS1053 chip but I don't get any sound out. It shows it's playing in the serial monitor but no sound. I am sure it is a bit i need to flip but finding it in your code is being stubborn. By the way this is great. I am hoping I can get it all working on my mega then port it over to my DUE. So I can use integrate it into my gauge display for my 69 mustang.
I had to replace lcd.init with lcd.begin (in the setup void.) to get the lcd working. Possibly different version of the LiquidCrystal_I2C library.