I'm using a Riot as my main OD/Dist into clean amps and I love it. If I'm using it with the gain around half or a bit less, I like to kick something else in for the uber-sustain. Currently using a Sparkle Drive but I think it's a bit bright sounding - adding a bit too much upper end sizzle. Any ideas for what I could replace it with? I was thinking maybe the Shiba Drive as I could also use it as a stand-alone low gain OD, or possibly the Koko Boost? Any other suggestions?