 Harmonics, palm mutes, hammer-ons and pull-offs, and pick slides are not easily picked up by guitar synths, largely due to imperfect fretting technique; with the exception of harmonics and palm mutes, these techniques can be achieved with a concentrated effort to maintain good fretting.Similarly, the synthesizer portion of a system often lack the variety of controls (sliders, faders, knobs) for synthesis parameters that are normally available on a standard keyboard synthesizer.Nevertheless, controlling a synthesizer with a guitar has some advantages over a keyboard.