Hello jjv:
I am very glad to help.
The range setting can be configured on "DAQmxBase Timing.vi". In your program, you placed a control on the "Samples per Channel" and "Rate" inputs. If you placed a high value on "Samples per Channel", then it would acquire more samples. If you placed a high value on "Rate", then your acquisition would be faster.
You can set the voltage trigger using "DAQmxBase Trigger.vi". You can set it to start on analog edge, although not all hardware supports this kind of triggering mode.