Can I have a general daq event in visual basic while outputing in dma mode?

[roz]

Hardware: PCI-6711
Software: Visual Basic 6.0
NI-DAQ 6.9.3f3
Windows 2000

I can't get the GeneralDAQEvent_Fire subroutine to happen. I'm trying to output two synchronized waveforms on two channels at sampling rates that can be changed on the fly. To do this, I've set the clock source of the channels to be the GPCTR1. I output on a pulse train on the GPCTR1 and adjust the pulse widths to vary the frequency. I need to be able to switch to the new pulse width at a precise time so that the correct samples are output at the correct samplerate. I want to generate a general daq event which fires whenever a certain number of pulses (and thus samples) on the GPCTR1 have been output. I will
then reset the event and output samplerate within the GeneralDAQEvent_Fire subroutine for the next section of samples. I need to output at up to 1 MSample/second, so I need to be using DMA mode. I have not read anywhere that DAQEvent 0 Aqcuired or Generated n Scans requires interrupt mode, am I wrong about this? I have set my Channel string to CTR1, does this reference the GPCTR1? I set the board, DAQTrigVal0 and enabled properties and then call the refresh method. Is there something else I should do?
I have been reading the NIDAQ Function Reference Help and the NIDAQ for PC Reference manual and have not found a solution. Any suggestions? Also, where can I find info on what the ConfigureDaqEvent method is supposed to do?

[Spencer S.]

Roz,

First of all, I think you will want to use DAQ Event 1 since you desire for a message to be sent after every N updates. This will be more efficient than removing the current message and adding a new message each time the event fires. Furthermore, DAQ Events 0-2 can all be used with DMA transfers. However, you will be unable to use a counter channel with DAQ Events 0-2. Instead you should use one of the analog output channel you are clocking with the counter's output.

Good luck with your application.

Spencer S.