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If this system is still under warranty get it to a warranty service center. This is an early stage symptom of failure with the Power Amp IC. Fender has a good warranty policy on this stuff - 1 to 3 years
If not under warranty you may want to wait until it the problem is more persistent - easier for a tech to fix - unless it IS every time right now. A good tech can identify the issue quickly once "on the bench". My 'gut' feeling is the Power Amp IC when the system is first energizing to full stable power.
Verify the footswitch with an ohmmeter. You should find that each of four pins should have continuity to pin 2 of the connector when the switch associated with the pin is pressed.
Note the pin numbers on the connector seem to have a weird layout. Here is a link to your amp schematic. The Footswitch interface is shown on page 3 of 12.
Use the ohmmeter to check each wire in the cable is good. SOme cables, unless the official one for the unit, may lack some wires.
The amp "reads" the footswitch state into a register which is then read serially. The inouts are pretty well protected from user mistakes. With the schematic you should be able to analyze the failure.
colearthur16, Only a slight chance of problem with your speaker. You will need to prove that all stages of amplification of the audio signal from input to output are not being driven into distortion (clipping) because of a bad DC power supply rail to the low level amplifiers or the high power "final" output amp! To prove this, you will need the help of an electronics technician who has access to a variable audio signal generator (amplitude and frequency) and a cheap 5 to 20 megahertz oscilloscope to view the amplified waveforms of the amplifier stages in the Fender Amp. Remember the following statement for the rest of your life!!! "All musicians who use electronic amplification to play musicial notes through speakers should have between 4 and 8 hours of classroom instruction on how typical amplifiers (tube and solid state) operate and how to troubleshoot them when they fail to perform to rated specifications!!!"
Cole, have the Fender amplifier (not the speaker) tested by a qualified technician to prove amp is not at fault!!! 12fixlouie
You will need at least a 24 channel mixer to give you spare channels. You also need an active crossover and a snake. The advice you need is too much to include here so I am including some links:http://mixonline.com/live/FixIts/, http://en.wikipedia.org/wiki/Live_sound_mixing, http://mixinglivesound.com/blog/tag/outdoor-concerts/,http://mixinglivesound.com/blog/, and http://www.scribd.com/doc/11435651/Beginners-Guide-to-Mixing-Sound. You may need more monitors than you are planning on and you might consider in ear monitoring.
If you ran from the speaker out to the direct box you may have damaged your output stage on the amp and the direct box. The best way is from a line out, recording out if your amp has one. Ann alternate way is from your headphone out if your amp has one.
Ok, so I hope you realize the Fender FM25DSP guitar amplifier is an "entry level" NON-valve amp with a DSP chip that has model shaping tones. I am sorry but this is a toy and Fender did not spend the tens of thousands of US dollars to have built-in tones that truly 'kill". This not digital modelling like Line 6 or Fractal Audio did and so you have a problem from the start. This amp was always intended as an entry level amp for the bedroom only and never to be used on stage.
Jazz and acoustic modes have some similarities requiring mid-range boost and some rounding. Not easy to achieve with a DSP chip that costs about US$10 to manufacture. Sorry, consider using the amp for practice but look at a more serious valve amps for live on stage
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