Yes the Triton is an upgrade to the Trinity. I owned a Trinity for 3 years before getting the Triton so I can tell you about similarities/differences etc. I have since sold my Trinity to get the Triton.

Let me just start off by saying the BOTH KEYBOARDS ARE AWESOME in terms of sounds, sequencing and effects- ie- as workstation keyboards.

Soundwise there is not much to choose between them only that the Triton has alot of extra drum sounds.

Effects wise, whilst the Trinity is very flexible, the Triton improves slightly in the way the effects are implemented.

The Triton contains a proper sampler whereas the Trinity required the 'flash ROM' option to load extra samples into memory- it could not sample it self. The Triton's sampler can be expanded up to 64MB of ram.

In terms of synthesis, the Trinity has better filters whilst the Tritons has better LFO's.

The Trinity allows you to add a 4 track hard disk recorder that can sync to the sequencer but I don't think it is worth the money.

Both allow you to hook up to external hard drives if they have their SCSI option installed.

The Triton has almost twice as much polyphnoy as the Trinity- 62 notes as opposed to 32 notes. The Triton also has 4 real time control knobs on it's front panel.

Both offer flexible onboard sequencers but the Triton's is a little easier to get around and contains a few extra features mainly the ability to trigger patterns from any key, cuelists (able to chain parts of a song together to create one large song) and there are also 2 very flexible arpeggiators onboard.

The Triton has 6 freely assignable outputs verses the Trinity's 4 outputs which offered very spastic routing options.

Both instruments contain huge touchscreens but the Triton's is better to use.

It probably looks like the Triton offers more than the Trinity. However, if you get a good price on a Trinity, don't be afraid to just go for it (I think about it's biggest limitation is it's 32 note polyphony!).

However, I must say that you are better off getting the Triton as the extra features it has over the Trinity (mainly the added polyphony, sampler and arpeggiators) are well worth it.

However, try both boards out for yourself and come to a final decision only after playing both.

Hope the above helps you. Cheers.