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Likelly the TDA7293 chip in the power amp has failed. It shorts to one power rail and drags the power down where it hums... this CAN damage the speaker if left on. Verify the problem and replace the chip. Slight chance there are bad electrolytic filter caps but those are easily spotted.
I got mine apart by wedging a screwdriver in and twisting until it popped apart. (nothing broke) I started at a bottom corner and worked my way up the side until it came loose
The problem is that the broadcasting antenna at the top of the remote is very a very thin wire wrapped around a heavy cylindrical magnet and its solder points are extremely weak. You most likely dropped it and it came loose. I re-soldered mine and it worked perfectly.... until it broke again. The leads are very small and hard to fix.
Chalk it up to poor design.
You need a directional microphone, and then it needs to be pointed away from the guitar. Another technique would be to provide some acoustic insulation between the mic and the guitar, like a wall or a partition like what is used to set up office cubicles.
You've got two inputs on the DP-02 so you can record two sources at once.
Depending on how you want the electric guitar recorded (mic the amp, or direct line in) you can in the first case plug your guitar mic into one of the mic inputs on DP02 and plug your vocal mic into the other mic input. You also have the option of plugging the guitar directly into the DP02 (using the hi-z input - I believe it is labelled 'guitar' or something on the DP02. I any event I believe it's the one on the left). This way you only need one mic for use recording the vocal part.
To avoid any 'bleed' between channels you can use the headphones while recording this way and you'll avoid having the unamplified guitar sound coming through over the vocal mic.
Once you have the mics or guitar and mic plugged into two inputs, you need to assign the inputs to a channel (track) to record on. You do this by pressing the select button for the input and then pressing the select button for the track where you want to record the input. Do this for both inputs so that they are recording on different tracks. Then arm the tracks for recording by pressing the record button for each track and the lighted buttons will flash above each armed track. Then just press play and record and you'll be recording. You can go back and redo it as many times as you like and record over what is there, or preserve a take and assign a new track (or tracks) for another take. You've got 8 to play with.
1.make sure the guitar/mic switch is pointed to the guitar side. increase the guitar/mic level. increase the output level.
2.another thing you can do is check the "sound and audio devices" to see if everything is set to Edirol UA-4FX. If everything isnt, fix it so that it does. and remember to disable your computers stock sound card. Edirol UA-4FX is your new sound card from now on.
3. if thats not the case, try reinstalling the drivers.
4. If all of the above fail, you probably have a loose connection/ bad wiring in the guitar/mic 1/4" input. you can choose to open up the device and solder that yourself and possibly lose your warranty or have the entire unit replaced.
Hope I helped! good luck!