Summarize the following:
The saddle is the part of your guitar that's below the pickups, on the opposite side of your headstock. If you've never adjusted the guitar's intonation, your saddle might be more difficult to move. Before you adjust the position of the saddle, loosen the strings so that you don't create unnecessary tension on the strings which could cause them to snap. If the saddle is being difficult, you can wiggle it back and forth with your fingers until it moves. If your note is flat, you'll want to move the saddle up towards the headstock. Loosen the screw a quarter turn to sharpen your note. You may have to do this several times before the string on the 12th fret is correct. Use a screwdriver to tighten the screw on the saddle if the string that you're playing is sharp. This will move the saddle away from the headstock and will flatten the note on the 12th fret. Once you've made adjustments with your screwdriver, you can re-tune your strings. Test the note on the 12th fret and take note of whether you corrected the problem. If you turned the screw too far, your string might be off the correct tuning. If this is the case, then loosen the string again and adjust the screw more until the string plays in tune, on the 12th fret.

summary: Loosen the strings to give the saddle freedom of movement. Loosen the screw on the saddle if your string is flat. Tighten the saddle screw if the note is sharp. Retune your strings.

Summarize the following:
If you have headphones plugged in, you won't be able to hear sound from the speakers. Sometimes inserting and removing a headphone plug will get the speakers to switch back on. If you have multiple audio devices connected to your Mac, it may not switch inputs correctly. This will display a list of devices that can output audio. Select the device that you want to use to play sound. If you want to play sound from your Mac's speakers, select "Internal Speakers" or "Digital Out." If you're trying to play sound from your connected TV, select the "HDMI" option. Many external speakers will have their own volume controls. If the speakers are turned off or down, you won't be able to hear sound from them even if they're selected.

summary: Ensure you don't have headphones plugged in. Click the Apple menu and select System Preferences. Click the "Sounds" option and then select the "Output" tab. Select the proper output device. Check the volume level of external speakers.

Summarize the following:
Leaving dirt or other particles on the wood can keep it from properly absorbing the paint, primer, and sealant. Clean the wood before applying sealant by wiping it down with a damp cloth. You can use a tack cloth to pick up any remaining dirt. Tack cloths are gauze-like materials treated with a sticky substance and can be purchased at any home improvement store. Brush a thin coat of glossy acrylic medium sealant onto the wood using a dampened sponge or paintbrush. Allow the sealant to dry, and then apply another coat to the wood. Lightly sand the wood after the second coat of sealant has dried to remove any excess sealant and then wipe it down again with a wet cloth and tack cloth. Use a sponge for wood surfaces with grooves and curves and a paintbrush for flat surfaces. The sandpaper should be around a 220 grit. Using primer provides a surface to which paint can adhere by allowing the wooden surface to regain surface tooth (ridges and valleys). An acrylic gesso is probably your best option for using primers. You will only need to apply one coat of a high quality primer, lower quality ones might require a second coat. In order to maximize paint adhesion, you'll need to allow the primer time to dry. This could take several hours. Once the primer is dry to the touch, you can start applying your paint.
summary: Use a wet cloth to clean the wood. Apply 2 coats of sealant onto the raw wood. Apply a coat of primer to help the paint adhere to the wood. Allow the wood to dry and cure.