No, I use a separate amp head for the talk-box tone to the one I use for the main guitar tone and switch between the two with an A/B box so the talkbox actually stays 'on' the whole time (i.e. I don't use the stomp switch on the Heil to switch between the guitar/talkbox). I tend to run a slightly more metallic patch for LOAP anyway (crunchier than necessary) but when you add more gain through the separate head, it adds a gutsy 'metallic' edge to it - you have to watch your treble though as it's easy to go overboard with the higher frequencies. I tend to balance out the fact that you inherently get a lot more treble from the small talkbox horn driver by adding more low end on the talkbox amp head.

If you then get the talkbox sound to the back of your throat to shape it, the sound becomes nasally metallic which is signature Richie - or as close as I can get at any rate.

Hope that helps.