I want weighted keys that feel exactly like a good upright piano. I want the tones to fade out gradually exactly the same as if you slam down a five-finger chord on a Steinway and let the sound fade to nothing, with the faint overtones from the strings that are covered by the dampers.
I want it to sound different if I pick up the dampers 60 seconds after slamming down the five-finger chord.
I want it to sound different if I use the sostenuto pedal instead of the damper pedal, and different yet if I don’t use any pedal but hold all five keys down.
I want to be able to play a glissando of all 88 keys (assuming that it has only 88 keys; extra points for extra keys, like, say, another octave in the bass for a total of 100) and have all 88 ringing out at the same time, rather than the most recently played keys erasing the others.
I want keys that feel different and sound different when I have the una corda pedal down. A more delicate sound, more easily created with less key pressure.
When I hit a chord, hit the sostenuto pedal, then play some stacattos while the chord holds, I’d like to hear some ghost harmonics from the struck stacatto keys.
I should be able to touch a single key and make a sound so faint you can’t tell for sure if it played or not, then gradually add more.
The harmonics from the bass registers should be rich and impressive, like a Steinway.
I should be able to hit the damper pedal and play a riff, let it “mud”, then lift up on the damper and hear the reverberating strings damp out gradually, not all at once.
I should be able to strike a double octave in the bass, hit the damper a split second after I’ve struck them, and have the harmonics in the treble register echo much stronger than if I hadn’t.
I should be able to smack a note sharply and hear not only the string resonance but the sound of hammer impact.
The model that was suggested to me (as I mentioned) was a Roland HP-2800, do you know anything about them?