Hello;
Yes, you can do that. To control the Analog Output values that go out to the analog output channels, you just need to change the data points in the buffer that is written to the analog out channel.
Since you know the update rate of that particular channel, you can create a small subVI to calculate the datapoits to be written to the buffer, based on the slew rate you need.
Hope this helps.
Filipe A.
Applications Engineer
National Instruments