[PD] messaging question

Hello list

I am trying to build a live capture and loop sampler in pd.

I have 3 controls - start point, end point and record.

Start point defines the point in the sampled array to start playback, end point defines the point to end playback. Thus I can use sliders to define the limits of a looping sample:

http://www.yeeking.net/pd/sampler2.png

The problem is that every time i move the sliders, i have to retrigger all other numbers in the system to make the sample play back as i'd expect. E.g. if i move the start point slider, I have to click the end point slider then the 44100 message in the above image before it plays back as i want.

I have connected a metro that bangs the sliders and the 44100 message, but this seems like a bad solution...

http://www.yeeking.net/pd/sampler2_metro.png

Can anyone suggest how to update the 44100 message and end point slider automatically?

cheers

matthew