Building a switching system (Long)

[arielfx]

Here goes…

I was offered to do this project by a guitar player who plays with some well known local bands, he turned to me after no one agreed to build this system for him and I told him myself that I'm not sure I'm up to it but he bugged me until I agreed to take a look at it.

At this point I would like to thank anyway who will assist me with this switching system and if it will get done I promise to write a step by step guide that will be hosted on my website so anyone can build one of these in the future. I know I still didn't do the Halo inductor picture guide but that's only because I didn't get the parts yet â€" When they'll get here I'll do it ASAP!

Let's get back to the switching system. This player uses a preamp made by Boss called GL-100. This is a fairly simple unit made in the mid 80's, it got two channels but I'll approach it as a single channel unit because he won't be using the second one.
There are no presets (memory) on this unit; you have to dial in everything with the pots if you want to change the sound. The channel comes with a 4 way rotary selector switch which engages different boosts and cuts to the sound, the use of this button got a dramatic effect on the output volume level of this unit.
As far as I am concerned the ONLY knobs on the unit are volume (=gain) and master volume. The EQ section will be swapped with resistors to keep it in flat mode all the time. The new "EQ" will be a DOD based BIFET buffer with level and tone controls that will come before the input on the GL-100.

So the signal goes like so: Guitar  DOD Buffer  Boss GL-100  AMP

To the interesting part: The end product (or shell) should have 4 footswitchable channels where each channel got a control for level and tone for the DOD unit and volume and master controls for the Boss GL-100 Unit.
When I hit channel one the guitar signal is switched into the input of the Boss GL-100, at the same time tone and level controls of the DOD are switched into the circuit and same for the volume and master controls for the Boss GL-100 unit. This should also switch the the first position of the 4 mode rotary switch for channel one.

Naturally each channel will allow different settings and this will give much greater flexibility for the user. When another channel is switched on, channel one is the disconnected and all the controls of that channel are linked into the DOD and the Boss GL-100 units and the equivalent 4-way rotary switch position is selected (first position for channel one, second for channel two, third for channel 3 and forth for channel 4).

What I was thinking about doing is run the guitar signal into the DOD from there run it into the input of the GL-100.
The tone and level pots of the selected channel should be switched into the DOD and the volume and master pots should be switched into the Boss GL-100.
LED indicators should light up near the switch of the selected channel.

Now, some of the pots are dual and quad-gang pots which give me many poles to switch at the same time and I simply do not know how to build something like this. I really don't know much about switching systems and I guess it's time I'll learn quickly
I think that mechanical relays are not the best idea because there's too much to switch at one time and I want to build something that will last forever on the road (if made, the box will be 3mm thick anodized aircraft aluminum).
I have pretty much all the budget in the world for parts and the only thing I'll have to make sure is that there is no delay when switching channels. That's all.

If someone wants to help me out full time I'll gladly give a fare share of my profits to him!