If you absolutely hate using TRS connectors or don't have any available, there's an option available to us right now that everyone should keep in mind. The two L/R channels can be set up as either pre or post fader, so if you set them up to be post-fader you can apply attenuation to the inputs via the faders. Now, most will want to use this option if you're only recording two channels of inputs, but if you're running two channels and your inputs are peaking and you have no more headroom on the trim knobs, just make sure you're recording L/R to the SD card and apply attenuation via the fader. I suppose you could use this option if you're using more than two channels too, but you'd need to do your L/R mixdown on the fly.