Could i use the nord pedal with my digital piano?

Marcus are you talking about the sustain pedal. Or do you mean an expression (volume) pedal. Not sure what you mean by it using midi.
 
If it is the sustain pedal the answer will depend on how the sustain pedal is configured. Does the pedal have a standard jack on the end of the lead? When the pedal is up (ie not pressed ) then the jack contacts will either short out (NC or normally closed) or remain open circuit. (NO or normally open)  When the pedal is pressed then a NC pedal becomes NO and a NO pedal will become NC.
 
You can use this with the piano as long as the piano expects the pedal to behave the same way. If the pedal however is wired the wrong way for the piano then you cannot really use it. You can easily test it by simply plugging it in. Don't press it to start with. If all the notes are sustaining when the pedal is not pressed (and not sustaining when the pedal is pressed) then you cannot really use the pedal with the piano. If the pedal does not work properly with the piano ie the wrong way around, some pianos are smart enough to detect pedal polarity on switch on and set themselves accordingly. Try turning the piano off with the pedal connected and turning it back on and see what happens. This may not work either. There may be a setting for pedal polarity in the piano settings and you will have to do it manually.
 
Check the pedal itself. Some of them have a little switch on the bottom which can reverse its behaviour too.
 
Then you could be lucky and the pedal will behave as per normal. ie not sustaining when not pressed and sustaining when pressed. You wont damage the piano by doing this only you will find out if it is going to work or not.
 
Now if you are talking about a volume or expression pedal things are a little more complicated then. There is a good chance it wont work.

Yes you are probably right Dave. They tend to use a stereo jack as the connection. There is a sort of standard out there. eg zero ohms to 10 K Ohms over the range of movement of the pedal. I have got an Emulator expression pedal that works with my Kurzweil.
 
But there are also other variations out there as well eg Yamaha has a very different method of doing it all together and it definitely does not work on anything other than Yamaha gear.
 
So if it is an expression pedal you are talking about then often the best approach is to as mentioned here get the one the piano manufacturer recommends.
 
What he might mean though regarding midi is that most often if you do connect an expression pedal to most things then that is often sent over midi out as a midi controller code. Handy for controlling other things over midi further down the line.

Jeff Evans
...Yamaha has a very different method of doing it all together and it definitely does not work on anything other than Yamaha gear.

I hope that's not a universal truth, Jeff, because I've just ordered a Yamaha expression pedal to use with my Hammond XK-1, to replace a cheap generic one that broke. I'm hoping the Yamaha pedal will be sturdier under my lead foot. I tend to hit pedals (and keyboards) pretty hard during live performance.
 

I may have seen that same posting, which I think said the Kurzweil expects a 50K pot.
 
Yup, I ordered the FC7. $40 versus a hundred bucks for the Hammond pedal, which looks exactly like the cheap crappy one I destroyed.
 

Holy crap, that (admittedly cool) gizmo costs $1700! Do you really want bass pedals that badly? 
 
If all you want is the expression pedal, those can be had for $40 - $100.

If your piano does not have an expression pedal input, a MIDI expression pedal may be the only way to go. One solution is to use a resistance-to-MIDI transducer like this. You can then plug any generic expression pedal into it and it will translate pedal movements into MIDI cc11 events.
 
The downside to that approach is that now you've used up your only MIDI input for the expression pedal, so you can't control the piano from SONAR when the pedal's plugged in. The solution to that is called a MIDI Merger, a device that accepts MIDI data from two sources and interleaves them into one output. 
 
So altogether you're looking at $40 for the pedal, $70 for the merger and $150 for the translator. I'd check Sweetwater or zzounds for prices, though, as they're probably a little less than buying direct from the source I linked to above.

The FC-7 is an analog expression pedal, meaning it's just a potentiometer in a box. You must have an actual expression pedal input on the piano for it to work. Look at the jacks on the back of the piano. If it doesn't have one labeled "Expression" (or maybe just "Exp.") then the FC-7 won't work by itself.
 
BTW, what model is your piano? (Should have asked that at the top!)

Will this work? http://www.sweetwater.com/store/detail/PedalExp/
 
And could I add the pk 6 later? For more organ fill. 
 
Thanks

Which pedal should I get with the midi solution pedal connector?

I look up Roland pk 9 manual. The $1700 not worth it for my piano. 
The pedalboard keys will work but the expression/volume pedal dose not because its analog. 
So I'll be spending more money just to use it...no thanks.. 
 
Marcus