cues do not fade into each other properly

[Daniel Finnie]

Cue[0] has 5 at full.
Cue[1] has 5 at half.

Cue[0].next
=> #<Cue:0xb742af38 @link=#<Proc:0xb7449078@./cue.rb:33>, @num=1, @scene=#<Scene:0xb742af88 @channels={5=>50}>, @out_time=3, @in_time=3>
>> setting channel 5 at 246.5
setting channel 5 at 4.25
setting channel 5 at 238.0
setting channel 5 at 8.5
setting channel 5 at 229.5
setting channel 5 at 12.75
setting channel 5 at 221.0
setting channel 5 at 17.0
setting channel 5 at 212.5
setting channel 5 at 21.25
setting channel 5 at 204.0
setting channel 5 at 25.5
setting channel 5 at 195.5
setting channel 5 at 29.75
setting channel 5 at 187.0
setting channel 5 at 34.0
setting channel 5 at 178.5
setting channel 5 at 38.25
setting channel 5 at 170.0
setting channel 5 at 42.5
setting channel 5 at 161.5
setting channel 5 at 46.75
setting channel 5 at 153.0
setting channel 5 at 51.0
setting channel 5 at 144.5
setting channel 5 at 136.0
setting channel 5 at 55.25
setting channel 5 at 59.5
setting channel 5 at 127.5
setting channel 5 at 63.75
setting channel 5 at 119.0
setting channel 5 at 68.0
setting channel 5 at 110.5
setting channel 5 at 102.0
setting channel 5 at 72.25
setting channel 5 at 76.5
setting channel 5 at 93.5
setting channel 5 at 80.75
setting channel 5 at 85.0
setting channel 5 at 85.0
setting channel 5 at 76.5
setting channel 5 at 89.25
setting channel 5 at 68.0
setting channel 5 at 93.5
setting channel 5 at 59.5
setting channel 5 at 97.75
setting channel 5 at 51.0
setting channel 5 at 102.0
setting channel 5 at 42.5
setting channel 5 at 106.25
setting channel 5 at 34.0
setting channel 5 at 110.5
setting channel 5 at 25.5
setting channel 5 at 114.75
setting channel 5 at 17.0000000000001
setting channel 5 at 119.0
setting channel 5 at 8.50000000000005
setting channel 5 at 123.25
setting channel 5 at 5.30825383648903e-14
setting channel 5 at 127.5