Good morning, I tried playing music through the analog soundboard at the church and found that while it played through -- the sound was not quite right. The instrumental part of the song sounded pretty good but the vocals were very muted compared to the original mix. I tried this before with a PC laptop and again with an iriver H140 and got similar and worse results on the same soundboard. Sound was very weak and sounded 'underwater'. No adjustments I found made any difference. I connected from the headphone jack with an 1/8" line-in cable to an 1/4" adapter into the board. The music format was an mp3 file. Do I need an interface of some sort? Is there an app that will help? Thanks for the help!