Roland GK-2A pickup. g string does not respond

I am no expert about such things but the electric guitar pickups work with steel strings, wouldn't work if the strings weren't steel - the pickup is a coil of wire and the vibration of the steel string generates an output in the coil the amplifier can work with.

The pickups of the acoustic guitar are presumably glorified microphones that would usually work in a similar fashion to the above, by generating an output but if they are active devices they will need a power supply in order to generate an output, something a standard amplifier input will not provide.

An active device either needs an independent power supply to make the device work like a radio needs a battery or the device will create the output by varying the current flow of the voltage applied across it.

A Gk3 cannot be connected directly to an electric piano or synthesiser. The 23 pin DIN connector connects the GK3 / GUITAR to a Roland guitar synthesiser which produces the synth tones . This unit can be connected via midi cable to any external keyboard or synthesiser...to produce different or varied tones from the external synth ........provided the devices are able to communicate with each other...see the midi implementation charts for each device for information....

You must connect a short jack cable between the GK2 or GK3 and you normal guitar jack out. Secondly, the switch on the GK should be in the middle, that will give synth & dry guitar simultaneously.

I would suspect a setup problem. Your best bet would be to contact Rolan Customer Service. /here's their link-
Roland Support

If you want help from Roland you will have to register:http://www.rolandus.com/backstage/login.php That will get you access to full support and their email address. I think you are having problems with your GK-3 pickup. Make sure your string that you are having problems with is the optimal height etc. The adjustment for the GR-20 is in the manual at this link:http://www.roland.co.uk/assets/media/pdf/GR_20_Q_A.pdf Make sure your pickup is installed correctly and adjusted properly first. The manual is here:http://lib.roland.co.jp/support/en/manuals/res/1811530/GK-3_e11.pdf If you have everything adjusted and only one string is not working then I would guess you have a cable problem and the best thing is to contact Roland for advice. I didn't walk you through the adjustment because every installation for every guitar is different. Hope this helps.

Find appropriate diagram at this site:

http://www.guitarelectronics.com/category/wiringresources/

The frequency of the A string when in tune is 110Hz.

What you are hearing is actually 120Hz which is the second harmonic of the 60Hz power frequency. It would be hard for you to distinguish between 110 an 120.

Try this test: Bring something that produces a reasonable magnetic field such as a wall wart power adapter that is powered near your pickup... Then you will be able to see that you are picking up stray magnetic fields from your environment.

Humbucker pickups attempt to quash such pickup by winding the pickup so stray magnetic fields cancel in adjacent coils.

Some pickup CAN occur on your cord and also in an amp.

If you leave your cable unplugged from teh guitar you are LIKELY to pick up some of this hum... The second harmonic pickup is COMMON when devces like full wave rectifiers are driven by transformers in the area.

Pickup height on electric guitars is an oft debated subject. It's more about personal preference, ..BUT there is a bit of science involved , and here is some real simple "String Theory" for electric guitars. Your pickups are magnets essentially, with little winds of copper wire - this is how a transducer (pickup) picks..up (hence PICKUP) the sound of the strings. Strings are steel , most brands have Steel wrap around a Nickle core, ..it is ALL attracted to magnetics. You've played with magnets before , right? What happens when you put a magnet close to metal? It...PULLS it , right? Now , here's the deal about THAT , for guitars. The closer you get a vibrating string to the pickups , the more signal the string will produce , BUT if you get TOO close, the pickup will start pulling on the string too much (remember..magnetics) and that will reduce the amount of sustain on a string(s), and may even hamper actual tuning depending how strong the pickups are. Of course there is the "Duh" factor - having your pickups so high that your strings actually rub them as you play , ...don't do THAT! Best advice: Keep the pickups about mid-way. Not high enough to cause any noticeable problems, but not too low to sink them below the pickup rings (the plastic rectangulars that surround the pickups.

String gauge is a personal preference. I'll ask you this: what is your playing style? I see your picture and its a Jackson DK2M. One thing to remember is that the Floyd Rose usually needs adjusted with a different string gauge. With a Floyd, I recommend replacing one string at a time unless you are cleaning the neck with steel wool. If you are taking all the strings off at once and changing them all at once and not one after another, put a towel under the back end of the Floyd Rose so it does not tilt back and mar the finish. Jackson usually installs 9's on their guitars, but this is too light in my opinion.

The pickups...there is a screw on each end of the pickup to adjust the pickups up and down. Raiseing them will get you more output but more noise and feedback. Lowering them will get you a more mellow sound. I keep mine no less than 3/16 to 1/8" from the strings.

Bridge adjustment...Floyd Rose trems are tricky little animals. They have small allen screws to raise the saddles up and down. Raise the bridge just enough to keep the strings from buzzing excessively and as long as they don't make a buzzing sound thru you amp, its nothing to worry about.

Send me a message if you have any more questions. With a Floyd Rose, it would not hurt to go consult your favorite guitar shop or a friend with a Floyd equipt guitar to see them work on them.

Santana's had quite a few guitars, take your pick:
1972 - Gibson Les Paul / Gibson SG Special with Humbuckers / Gibson L-6S
1975 - Gibson SG Special with P90 pickup (Woodstock Festival)
1976 - Yamaha SG 175B / Gibson SG Special with 3 Open Coils
1982 - Paul Reed Smith (PRS) Custom
1988 - PRS Santana II with PRS Santana III nickel-plated pickups and .009-.042 D'Addario strings