Make sure the "Decrease movement speed is only once, and not a parallel process OR autostart event, otherwise it will repeat itself until it is at the slowest speed.
Make it a switch in the event, or simply start the game on a map with "Decrease movement speed x1" and then teleport the hero to another map, that way it will simply decrease it once.
an example:
Move Event: Hero, Decrease Movement Speed,
<>Teleport: 0001Starting Map (001, 001), Retain Facing
Now, you should usually make this an opening or intro, even a short one will do. So that it isn't just a random map momentarily appearing and then reappearing on a diffrent map.
And as for the characterset. Sadly, RPG Maker only supports 8 sets of 3x3 frame animations, Three Walking Up, Down, Left and Right. I've edited it for you so it should work.
NOTE: when importing it, make sure you RIGHT click on the GREEN background. This will make it flash indicating this color will be
invisible in the RPG Maker. (
There won't be a green box surrounding your character in game.)

This should work!
Also! Make sure as stated by Tiro&Millet, you should your recources via the RAW Material Editor, otherwise you will skip the oppertunity to get rid of the background
As for turning the music off, open the event tab in your event, do this by right clicking on a blank area in your event and click to INSERT, click on tab number 3 and click PLAY BGM. Go to the very top where it says (OFF). It should already be highlighted, but if not, press OK, this event action turns off the music currently playing.
If you're trying to make the music turn on ONCE, and then Turn off after the next examination, you need to do the following:
First, we need to make a new event, choose its graphic, I chose a super awesome lamp to be my radio, and create a new switch, but first we're going to make the first part of the Radio: The only thing that needs to be changed is the event graphic, and adding a new event page, to add one simply click the P on the top of the event window which is labeled New Page, make sure both event pages have their TRIGGER CONDITION is set to Action Key. and now click on the Tab Number 1, this is how you make new event pages for diffrent situations. After this is done you will be adding the two following displayed in the picture:
<>Play BGM: CHOICE OF MUSIC HERE
(when choosing this music, you will also notice you can fade it in, choose drag the slider under Fade-In time about two notches up. This'll make it more realistic. After you're done happy with the music configuration, press OK.)
<>Switch Operation: [0077 RADIO IS ON] ON
(This is done via the SWITCH OPERATIONS button in the first tab of the event commands window, so click this. When the new window opens up named: SWITCH OPERATIONS, tick the circle named Single Switch. Next click the box which looks like this: [...] You'll notice a box with numbers and blank spaces in it, choose the number which is under the most recent switch you created, or if this is your first one, click Number: 001:, and name it:Radio IS ON. Press APPLY, and then OK. Make sure, under the OPERATION header, the circle ON is ticked.)
After it should look like so.

After this is done. click on the Tab which has the number 2 on it. It will be slightly diffrent from the first tab, as displayed like below. Make sure under the Preconditions Header which is directly under the event page tab number, tick the box and press the [...] Box, and find and press OK on the switch which you named RADIO IS ON. Make sure it is also the SAME EVENT GRAPHIC as your event graphic you chose earlier. I.E, if the radio was your event graphic on Event Page No.1, make sure the radio is the same graphic on Event Page No.2. After this is done add the two following:
<>Play BGM:(OFF)
(As I explained earlier in the post, you will have to turn the music off via the PLAY BGM function in the Event Commands Page No.3.)
<>Switch Operation: [0077: RADIO IS ON] OFF
(This may look visually confusing, but as you did on event tab number one, simply tick the
OFF under the Operation Handler box instead of ON.

And there we have it, So now when we examine the radio, it will play the desired music, while it waits for Event Page No.2 to do its thing, turning it off, which will jump back to Event Page No.1 waiting for the player to turn it on.
Event pages take priority over other pages if they have a switch or variable which needs triggering.
Hope this helps~!