Well if the synth doesnt just hold the note, try using some reverb.

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Evil is an art and I'm friggin' Picasso!! ~Veldrid

Or you could increase the realease time of the amplitude envelope from the sound, or you could make a loop from the sound.
An envelope is part of synthesizers and samplers, were you can edit the sound with,, so that the sounds becomes a different shape.
You could make a loop of the sound with a sampler, were you loop (let repeat) a part of the sound so the you can make it sound longer.

A lot of software support these features.

yeah try fooling around with sustain as well,

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"Laces out Dan!"-Ray Finkle

This may a stupid question, but I gotta ask...

Where do I find a knob for "increase the realease time of the amplitude envelope" in Reason?

On the substractor there is a amp envelope section. You will have to adjust the R (Release) option there.

On the Malstrom you will have to adjust the r option too on the osc A and osc B section I believe.

Onh the NN19 the same: adjust the r option
from the Amp envelope section.

Thanks for the advice! I'll go and try that later today

It a hard one, methods that will increase the length by a little are: reverb and timestretching, but not by a huge amount.

If you set up a loop point on a sample, were it plays the first half and then loops a section till you release a key that would work the best.

Im not sure how to do it with what your using, but have a look in either your editor or on your sampler.

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