I have had it for 11 days now. I'm not an experienced saxophone player, but I know a lot about switches, software and "keyboards". If you blow steadily into the mouthpiece (an achievement in and of itself!) and play a short scale that uses the suspect keys, they should all fiunction. Also try moving between just a few of them at a time, up and down on three or four notes. Or memorize a short exercise and practice it. Is it getting any better? If so, then you need to practice. If they keys still don't seem to function properly, there may well be a hardware or software problem.I got my Yamaha yesterday. I have found that sometimes some keys don’t work.
I've looked at a lot of demos by very advanced, experienced saxophonists. I can occasionally hear a few very slight "miskeys", and these are people chose to demonstrtae, sometimes brand ambasadors. Remember, they could have done retakes or edited until there were no such things oin evidence. When I play mine, it's the same, the fingering of switches will never work exactly like a traditional instrument. In fact, my mantra from the start was, and is still:
The YDS-150 is NOT a saxophone.
So, in short, I wouldn't say it's your fault, but you probably need more practice. The coordination and accuracy on this digital instrument is actually more demanding than the saxophone. But there could be an issue with the unit you have.
Here's me testing the fingering response via MIDI which has even greater triggering lag.
View: https://soundcloud.com/randulo/yds-150-midi-only
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