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Hi All
I have a sabertooth 2x32 which will run using the standard Movement Panel and coded scrips. This means I have no control of the speed unless I change the code or the ramps in sabertooth.
When I use the sabertooth Movement Panel only one motor drives forward and sometimes not in reverse. I read that this Movement Panel needs some changes, but how to config the panel is past me.
Can anyone help?

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Synthiam
Greetings! I'm the support robot! I've searched other questions, tutorials and controls related to your question. Take a look at these links. They're all sorted by what I believe is the most relevant:
I've never used a Kangaroo for wheels. Only with motorized joints. However from what I learned when I was studying how the Kangaroo worked so I could incorporate it into my robot it will watch the feedback device and adjust speed and torque when needed as the unit rolls along. This will keep the speed steady when going up or down hills and over rough terrain. Kinda like the cruise control on your car does.
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Tony (Toymaker) did a video a couple of years ago showing this work.  I am not having much success with searching the community lately, so I'll leave finding as an excersize for the student:)


Edit.  Actually  I found it    https://synthiam.com/Question/8542
United Kingdom
I have ordered some new motors with encoders attached which should help with the control. Some encoders I tried were using HALLEFFECT sensors and had to have pull up resistors to work, however they were not that good and would work sometimes.
Lets hope that the Sabertooth and the Kangaroo combined work so that I can have complete control over speed and direction.
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I've never used the Hall encoders with the Kangaroo but have talked to others that have. They had good results with them. However like me they were using them for motor positioning and speed. Maybe quality has a part in it. 

I also added resistors and they seemed to help a lot in completing a successful tune. If I remember correctly DE recommends to add them if your encoder is a long distance away from the Kangaroo. It's in the kangaroo manual if you want to check.
United Kingdom
Quick update.
Silly me I thought I ordered motor/gearboxes with encoders....however the motors drives the bot quite well using sabertooth as a custom Movement Panel.
I have a 50 amp h-bridge coming from that online auction place, as per a certain snow plough built by the boss. that should overcome the control problem I have been having.
The sabertooth and kangaroo now seems to work on some small angled motor/gearboxes I intend to use for other functions in the bot. Using the DEscibe software tune function the procedure is very easy and then a servo panel on the ezb4 will contol the motor/gearbox according to the tune settings.
Thanks to everyone who has commented, very useful.