Compare and contrast:

So when you said:

I'm up for it, although letting me loose and trying to keep my brain tied down to minutes and seconds may be more than a bit tricky...

You weren't really saying you were up for presenting a radio show. That's a shame I wouldn't offered to help if I had known it wasn't true.

I thought you were interested in the music. Yes - you love it in a different way. Those reading your post of how you would run the radio show you now say you don't want to do can judge your attitude from that.