It's hard to believe that I've never really used the Tempo View window that much but last night I needed to ramp down the tempo over the course of one measure from 92 BPM to 72 BPM. I just wanted a straight line ritard of the tempo from measure 74 (first beat) to measure 75 (first beat.)
I got the window that allows you to create a series of tempo changes over a range. However, start time and end time was asking for a hours, minutes, seconds type format and I wanted to enter measures, beat, ticks format.
Seems that there was a tick box somewhere that would change the internal time format of SONAR from HMSF to MBT. I just can't seem to locate that. Changing the Time window or Time ruler format didn't do what I wanted.
Also as a work around, I drew the tempo change in with my mouse. Wasn't SHIFT + Left mouse press the way you got a straight line of changes? Couldn't figure out what combination would do that.