Tony,
I believe you were playing the correct voices called "live" voices, however you must not have been playing the guitar voices that contained the multi layered samples. It is easy to select other guitars that don't contain these "extra" sounds when played with different degrees of harder and softer velocity. Perhaps you were playing the guitars not containing them and maybe you just weren't playing the "mega" guitars at the range on the keyboard that would trigger these more realistic guitar sounds. Regardless, someone who knows these keyboards should have been showing them to you.
Yes, I sell both the G70 and the Tyros, however I don't have a Tyros on the sales floor currently because I feel that with a new Tyros II soon to be released, I don't want to have a first generation on my sales floor if it's value will go down and it will be harder to move. It's not that the Tyros is not a great keyboard, it's just an economic thing at my store.
Comparing the Tyros and the G70 is a tough one. I like the 76 key G70 for it's size and it's solid feel. The Tyros only has 61 keys.
I love the sliders and ease of use of the touch screen on the G70. The vocal harmonizer on the G70 is a bit smoother to my ear. I really like that the Roland's sequencer always displays the chord progression of ANY song you playback, even if there were no chords added by the composer. I really like Roland's pianos. It's a toss up for sounds, styles (although the Yamaha has way more unplugged type styles stock from the factory). Ease of use for the Yamaha might not be quite as easy as the Roland yet it is easy once you've played with it for a short time. Both have 128 note polyphony. The Roland 16 track sequencer is the easiest I've used yet. Yamaha's sequencer takes a while to get used to it. The Roland keyboard is built in Italy and is very solid, the Yamaha is built in either China or Indonesia (can't remember exactly). The Roland costs almost $1000.00 more than the Yamaha, so this contributes to the decesion as well.
I have sold dozens of Tyros keyboards over the past 2 years. The Roland has only recently come to market and I've only had 6 to sell so far. Some love it and some think it's too close to the VA76 product it replaces. When customers came in and played the Tyros, they all thought this was really a brand new keyboard. Now, we also have the PSR3000 for much less money and most beleive it is almost the Tyros for 1/2 the price.
George Kaye
Kaye's Music Scene
Reseda, California