Thanks everyone. It seems I'm getting some very unpredictable results with the endings. Here's some analysis:

Song #1: A mixture of RTs and midi. 2 bar ending. Chord in 1st bar of ending is set to "No rest". RTs continue to play through both bars and creates a nice ending.

Song #2: 100% RTs. 2 bar ending. Chord in 1st bar of ending set to "hold". Chord is held and decays through the second bar (as expected).

Song #3: A mixture of midi and RTs. 4 bar ending. Chord in 1st bar of ending set to "no rest". RT's play for bars 1 AND 2, then stops suddenly with no decay.

Song #4: A mixture of RTs and midi. 4 bar ending. Chord in 1st bar of ending set to "no rest". RT's play through 1st and 2nd ending and decays in second ending. Not much difference from Song #1 with a two bar ending.

Song #5: A mixture of RTs and midi. 4 bar ending. Chord in 1st bar of ending set to "no rest". RTs hold on chord in 1st bar of ending (though it's not set to hold) and decays in 2nd bar. About the same as Song #2. Why wouildn't it be more like Song #4?

Basically, I'm seeing no real difference in the 2 bar endings and the 4 bar endings. And in one case, the 4 bar ending is suddenly stopping without decay.