Overall volume

I am using a Presonus Vls44 interface. I have my tracks all bounced down to 4 tracks labeled: Mains, Lead, Drums, Click. They are routed to the 4 outs of the interface. I have a FOH channel on my power amp, and a monitor channel. All 4 outs are routed to the FOH and monitor sends except the click. It is only in the monitor. I am not using any busses. I have it set up this way for these reasons. 1. I do a solo and duo show, so the lead can be muted when I work with a guitarist covering the leads. 2. The click only comes through the monitor and the audience can't hear it. 3. I play gigs with low volume and also high energy needs. I need the drums to be back in the mix for the soft gigs, and loud for the dancing gigs. 4. Depending on the volume of the gig, I tweak the outs for max sound quality. Here's my question: Can you think of a way to have the 4 outs still independent, but have an overall volume bus or control?

I am running them into a mixer. 4 separate channels labeled: Mains, Leads, Drums, Click.

I have a FOH channel on my power amp, and a monitor channel. All 4 outs are routed to the FOH 

This statment is confusing me, I read into this that your running directly into the Front of house Power amp. 
Are  meaning to say. You are running the 4 outputs into 4 channels of a mixer which then routes the signals to the FOH and/or the monitors. ??
Seems simple to me, And then you send the 4 channels to the monitors but only 3 to the FOH. all but the click.
So I still don't see the question?
Only issue I could see is if your mixer does not have pre fader sends for monitors.
If the question is really how do you turn all the tracks up and down, well your mixer would need sub groups or you'll just have to move 4 faders at once, no big deal. I can grab more than that when I need to.