Question 1

If unit receives midi, on how many channels simultaneously? What's the note polyphony? What's the warranty? How is the vibrato function triggered? thx

Accepted Answer

Bear with me, this might not be simple.  
Midi is still a mystery. When the unit turns on, a female voice announces: "Bluetooth Enabled."  There are 2 or 3 BlueTooth programs listed in the owners' manual. I tried to download "Perfect Piano" 3 times. It said "will download soon." Never happened.  
"Garage Band" was either non-existent or unavailable.  
As far as simultaneous channels, I never found out. Seems 8 is minimum ans 64 can sure produce any nuance. There is no midi connector. It's all done through Bluetooth, and I'm just learning that. So, it might work with B-tooth headphones. I bought a pair but I can't figure out how to link them.  I'm stuck with destroying corded jacks, for now.  I could get a 
B-tooth transmitter.  
I could not find the note polyphony data anywhere. This is odd.  
Sadly, the vibrato is "on or off."  A velocity sensitive keyboard simply takes the integrated output to velocity modulate the intensity of the vibrato.  This way, the vibrato can be subtly controlled, or expressed as an intricate phrase.  
All the controls are very rudimentary. time consuming and awkward.  I did get used to things but, buttons everywhere give you instant access to any sound.  
Maybe I'm naive, but this is the best action I've ever felt on any inexpensive.  
The portability and ease of set-up is great.
I do have to warn you, I bought the double frame keyboard stand.  It's super nice.  But the keyboard sags in the middle unless you put a brace from the stand to the keyboard. My old singer frame was rickety.  
Since it has a simple mixer, I run my antique Casio-640 through the mp3 input (it's analog, 500 mv signal.) Having a microphone input is nice.

Question 2

I can't find any information on the polyphony of this keyboard. Can it sustain several notes at once? If so, how many?

Accepted Answer

Hello Sarah, I thought I'd read that it was 88 note polyphony, before I bought it. However, now I can't find that statement anywhere. After playing it for awhile, I have not noticed any key dropout due to a higher priority note being played while previous keys are still depressed or held. I play 9-10 notes at a time. It is at least 10 key polyphony. May I also mention that virtually all modern keyboards are at least 10 key polyphonic. I had a Korg synthesizer 35 years ago that was 1 note at a time, yet I could get sounds out of it that I cannot reproduce on modern keyboards. What really stands out is the excellent action, velocity sensitivity and grand piano sound (through a sound system, the built in speakers are sound tinny.) 
Although a practice and teaching instrument by design, it is a great portable performance folding slab. Needs a center support for X-stands, great on a flat surface.
Keep on playing!

Question 3

Does it come with sheet music stand? the main picture shows it has it but the other don't?

Accepted Answer

Yes.

Question 4

Can I connect Bluetooth speakers?

Accepted Answer

I DO own the Costzon Keyboard and the keyboard literally speaks and says that it is in Bluetooth Mode everytime I Boot up the Keyboard. However, I do not own Bluetooth Speakers and as a result I have never tried to use the feature. But, I can surely confirm that it has a Bluetooth Mode. I hope this helps you in your decision making….

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Costzon88-Key Foldable Digital Piano Keyboard, Full Size Semi-Weighted Keyboard, Portable Electric Piano w/MIDI, Split Function, Sustain Pedal & Carrying Bag for Beginner (Black)

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