The entire range of my bassoon is a half step low. all the keys are working properly, but the instrument still speaks down a half step

Use the factory reset
Hold down highest white key whilst turning on
This should return to factory settings - pitch should now be back at A440
If you need to adjust then see page 19 of the user manual where it explains fine tuning.

1. Turn the main and monitor volumes all the way down (off). Plug a cd player into channel 9/10 and play a track of music of your liking. With the main/monitor volumes still off, adjust the gain on 9/10 until the clip light turns on, then back it down until the clip light just turns off. Put the channel volume at 12 o' clock.
2. With the music still playing, turn up the mains to the desired listening level first, and then adjust the graphic eq until the music sounds good in the room. Remember or mark the position of the volume control. Do not use the channel eq on 9/10 for music that has been mastered properly, leave the eq flat. Once this step is completed then you have now set the main eq.
3. Repeat the same for monitors. Turn off the main volume and then bring up the monitor main volume to the desired level first, then set eq. Now your monitor eq is set properly. Remember or mark the position of the monitor volume.
4. Set up microphone - plug a mic into channel 1 with volume all the way down. Speak or sing into the microphone and adjust the GAIN until you see the clip light, then back down a litttle on the gain. Put the monitor and main volumes back up to the mark from step 2. Now adjust the volume and monitor send on the mic channel to the desired loudness first before adjusting the mic channel eq. Use subtractive eq method to minimize distortion and feedback. ...i.e. if the mic is bassy then turn down the lows, do not ADD highs. If the mic needs bass, turn down the highs.

Please have a look at the instruction manual again. The 8ve keys are assignable/editable for up or down. You can change the range of the scale this way. I own a WX7 and a WX5. They both work this way.

Sounds like you have the accompaniment function selected. Find the button on the front panel and deselect it and you will get full control back

If anyone using a wireless guitar setup is close to it when playing, can do that.

Here is what it should look like when put together. Can't find any manual for it, though.
http://products.k-m.de/us/product?info=863&xd4765=b4bg1t2hp76a3r5di251v72p65

aprox $4500

A tube amp may take minute or two to warm up the vacuum tubes. Use CRC226 into the volume controls thru the little slot where the leads go into the pots. The pot may have been worn out and require replacement.

You have set the transpose to +1. You need to reset the transpose function to zero or no transpose.

Read here: http://faq.yamaha.com/us/en/article/musical-instruments/keyboards/digitalpianos/p_series/p-95_color_variation/4713/3479

Generally speaking you should only send low frequencies to subs. The highs, while lower in power than the lows, will over time harm the voice coils. The ideal way to do this is to use an external crossover netween the main output and the amp input with the higher range going to a general set of speakers. Send the lows through the second channel of the amp and then to the subs.

In short, while not recommended, yes you can hook them up in parallel.

Dan