Roger Rabbit was voiced by Charles Fleischer. (Paul Reubens was under consideration in an earlier version, and you can find his voice tests out on YouTube, which might be what you're remembering.)
Paul Reubens wasn't great. With the right direction he could easily have been as good as Fleischer, but I'm sure he was (incorrectly in this case) trying to show he could be less over the top than Pee Wee Herman, who was a known quantity in LA at that time.
What fascinated me is how I reacted to the Jessica Rabbit pencil test, where she snuggles up to the live actor. Even in that low resolution, lousy video transfer, I had a visceral reaction to her character. Those animators were all kinds of good even for a minor demo.
The test can be found here:
https://www.youtube.com/watch?v=rDKfLZNMtmU
Paul Reubens wasn't great. With the right direction he could easily have been as good as Fleischer, but I'm sure he was (incorrectly in this case) trying to show he could be less over the top than Pee Wee Herman, who was a known quantity in LA at that time.
What fascinated me is how I reacted to the Jessica Rabbit pencil test, where she snuggles up to the live actor. Even in that low resolution, lousy video transfer, I had a visceral reaction to her character. Those animators were all kinds of good even for a minor demo.