tempo chang and waves pictures

I changed tempo at end of my project to make a ritardando ending. After the midi files are done, I started to change them to waves format for mixing. all the tracks waves pictures are fine except of their ending exactly the place I changed the tempo. there is no picture in that specific measures I changed the tempo. I can hear them bout no picture. I used to do the same thing with X3 and no problem but with Platinum it causes this issue.
any help will be greatly appreciated
 

How many tempo changes end up getting entered? Are you drawing them in the tempo view? Wave-picture drawing issues can occur where there is too high a density of tempo changes. When drawing tempo changes, it's easy to enter too many and this won't necessarily make the ritard any "smoother". Musically, there is no purpose in having tempo changes between note events; all transitional tempo changes can and should be distilled down to a single tempo change for each note interval.
 
 

brundlefly
Wave-picture drawing issues can occur where there is too high a density of tempo changes.
 

I've seen this just yesterday but had only 2 tempo changes in the entire song (half time and back to normal) ... when starting to record a take after the tempo change, the waveform preview was only half length (due to double tempo) - but this is just a graphic/drawing issue as all the recording were captured properly

Thought I was seeing things the first time I encountered the disappearing waveform behavior.
 
In case the OP doesn't already know:  To visualize the waveform for editing, zoom in on the section of the track with the tempo changes and the waveform will magically appear.
 

brundlefly
This wouldn't happen if absolute time were the visual reference and measures changed length with tempo. I've often though SONAR should have a display mode that works this way. It's more logical in many ways.

A couple of other DAWs (S1, Rpr) do scale the measure length instead of scaling the waveform.  Can't say whether one is better than the other.
 
Ron
 
 

As Ron said, zoom in a little, and the waveform should appear more clearly. And I repeat my advice to only place tempo changes at note starts; this should help a lot.
 
As you've said yourself, it's just a display issue, anyway. It's only relatively recently in the history of music that composers could see the waveforms of the music they're composing, and somehow many ritards have been successfully written, played and recorded. Yes, I'm being sarcastic; all those questions marks made me do it. 
 
But, seriously, I think you're making a mountain out of a molehill; in the grand scheme of things, this shouldn't significantly be impacting your ability to write and record orchestral music.
 
I'll add that I think a better way to create a ritard/accel is to record a part (or just a reference track) in real time and then use Set Measure/Beat at Now to tell SONAR where the beats fall. You'll get a much more realistic result.

js516

brundlefly
That screenshot is a perfect example of what I'm talking about. It appears there are a dozen or more tempo changes per measure in places. Unless some instrument is playing continuous 8th triplets or 16ths through that passage, it isn't necessary to have so many changes.

I disagree. Effects and some synth patches that have elements tied to the tempo are affected. Also its a matter of simplicity. If I want a accel/ret between two points, a straight line the the fastest way to get it done so I can move on to the next spark of creativity and stay motivted. I donot have the time and patience to micromanage tempo on individual notes. That being said, i do think how sonar draws the waveforms is resonable. Bring up the waveform in the loop editor or melodyne works perfectly and if need be zooming in on the track revels the blank portions. Of course zooming is probably what your going to do anyway. :)

I am totally agree with you but I don't understand from the conversations passed why we need to adopt ourself with something that  definitely is fixable? As you said the waveform is fine in melodyne or loop editor so it means there is a bug or something that needs to be fix. :) 

js516

brundlefly
That screenshot is a perfect example of what I'm talking about. It appears there are a dozen or more tempo changes per measure in places. Unless some instrument is playing continuous 8th triplets or 16ths through that passage, it isn't necessary to have so many changes.

I disagree. Effects and some synth patches that have elements tied to the tempo are affected. Also its a matter of simplicity. If I want a accel/ret between two points, a straight line the the fastest way to get it done so I can move on to the next spark of creativity and stay motivted. I donot have the time and patience to micromanage tempo on individual notes. That being said, i do think how sonar draws the waveforms is resonable. Bring up the waveform in the loop editor or melodyne works perfectly and if need be zooming in on the track revels the blank portions. Of course zooming is probably what your going to do anyway. :)

 I can understand wanting to keep things simple when in the throes of creativity, but you can lower the snap resolution to match the note timing, and still draw a simple line or curve without generating more changes than necessary. And I think in the majority of cases, tempo-based effects and patches will also work best when the tempo doesn't change between note-ons. Sure, there are exceptions, but as a rule the fewer changes you can get away with, the better.