Brad Saucier

Yes.  Memory is like a USB flash drive or SD card.  It retains data without power.  

I'm pasting the following reply I wrote yesterday for another model, but it's the same for this model.
 
It's difficult to explain what Casio has done without using fancy charts and long winded explanations. Hopefully I can help clear it up with the following. I'll try to be a concise as possible. 
 
MIDI input is routed to its own sound engine (I call the MIDI sound engine). The keyboard itself is routed to it's own (I call the local sound engine). 
 
Most people assume (including myself at one time) that the tones you hear when playing the keys can be directly controlled by MIDI. With that assumption, one would think you can simply send MIDI program changes into the keyboard to change tones. Not exactly. Why? MIDI input does not communicate with the local sound engine.  This is so standard MIDI files can play as backing tracks while the keyboard can be used to play along, without interference.  
 
A workaround would be using a virtual MIDI loop back into the CT-S1, and merge program change data into the loop. I'm not familiar with iPad apps for this. I know of at least one Android app that can do it, but it's not very intuitive. Turn off local control on the keyboard. The MIDI sound engine is capable of generating all of the tones heard by the local sound engine, so it will perform as if local control is still on, except it's not. You're now controlling the MIDI sound engine by way of the keyboard itself as a MIDI controller. 🤯
 
In that scenario, it might be easier to think of MIDI input as a separate rack mount module, and the keyboard itself as the MIDI controller. I hope this helps lessen some of the confusion.

The CTX series features a USB to HOST MIDI connection.  A host is required.  That can be a computer, mobile smart device, or host adapter.  This is needed between the pedalboard and keyboard.  Also, USB MIDI input addresses a different section of the sound engine, not connected to what you hear when you play the keyboard itself, so keep that in mind.  You can use the mixer to select tones for the MIDI portion of the sound engine (labeled "song solo" parts in the mixer). 
 
Using a MIDI pedalboard is possible with software workarounds. I'm not familiar with all of the software possibilities for this, but I know DAW software can route one MIDI controller to any MIDI sound source.  I'm sure some mobile applications can as well.  

In the history of the PX-5S Facebook group, I've never known a PX-5S to have any issues with outdoor temperatures at any extreme, hot or cold. I think the white plastic body of the instrument helps with heat control, as opposed to a black metal body.  In general, I think the PX runs cool anyways.  

When you said the issue was on higher registers, that made me think your monitor speakers are probably favoring treble instead of bass.  Piano tones would accentuate this trait.  

A piano sound with a subtle hint of an early reflection type effect.  It evokes the sense of hearing sounds reflect within the cabinet of the piano itself, from the perspective of the player sitting at the piano.  

In the corner of the screen in the app is a settings button.  In that section you can toggle app sounds off.  

The exclamation mark means the tone has been edited and has not been saved as a user tone.  There is a write button in the editing menu to do this.  Follow the menus to complete the process.  If this still doesn't work, you'll probably want to explain what you're doing in more detail, perhaps add a video.  

It is under warranty right now.  If you perform your own service on the keyboard in any way, you'll risk invalidating the warranty.  Since it's only a week old, I suggest contacting the dealer you purchased it from for assistance.  
 

Make sure the only thing connected to the piano is a power supply cord.  Disconnect any USB cable or USB flash drive.  If that fails to solve it....
 
It sounds like something a technician should look at.  I suggest contacting your dealer or Casio support in your area for assistance.  Your piano is probably covered under warranty.  The warranty is 5 years.  

Those are two different parameters. The system works just like an analog audio mixing board, with channel insert effects (that's your tones with DSP), and channel sends for main effects (system effects).  
 
Reverb depth adjusts the output level of the final processed system reverb.  This is sent to the main output of the digital piano.  
 
Reverb send adjusts the level of dry sound sent to the reverb effects block for processing.  Sends can be different levels for each channel (tone).  

It is a semi-parametric EQ.  You can select the desired frequency for each band.  

It's simulating how a real piano works. The dampers in a piano needs time to stop the strings from vibrating.  Applying the dampers momentarily, very quickly, will not fully dampen the sound, especially on the more massive bass strings.  

MIDI data is like digital sheet music, no actual sound is transmitted.  It's just instructions to play an instrument.  You'll need to use audio in for sound. 

Heavy requires faster key strikes to reach the MIDI velocity 127.  Normal is a lighter setting, where slower key strikes will reach the same velocity level.  Turn on auto resume in the function menu to save this setting during power off.

It should be in the hex layer tone wave list.  Edit: Yes, 789 white noise. 

Every part is transmitted on a different MIDI channel.   Check your track input settings in Reaper.  I don't use that software, but it should let you choose which channel each track records.  Upper 1 is channel 1.  Drums should be channel 10.  

Yes, that's exactly how you "edit" tones and save your changes.  

Use the mixer.  It is under system settings.  

I don't think it can send metronome out.  It uses part 8 of the sound engine, but that's only for internal assignment. 

It has moved higher on the page.  

Press the function button and select auto accompaniment volume to adjust rhythm level. 
 
Press and hold the mixer button and go to the keyboard part group to adjust level of parts 1, 2, 3, 4.  In order, those parts are upper 1, upper 2, lower 1, lower 2. 

You can try blowing between the problem keys with computer cleaning canned compressed air.  Sometimes dirt can get in the sensors.  If that fails to solve it, unfortunately it will need servicing. 

You can try blowing between the problem keys with computer cleaning canned compressed air.  Sometimes dirt can get in the sensors.  If that fails to solve it, unfortunately it will need servicing. 

From your user guide....