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The Harp Tone+ is designed to make any amp a good harp amp by addressing the shortcomings of the guitar amplifier itself: the coupling caps, the excessive preamp gain, and speakers that do not have a good bass response. The pedal is essentially an active 2-band equalizer with a range of 20dB in gain to a reduction of 20dB in level for both bass and treble frequencies. The BASS control works far better than the BASS control on amps because it is tuned to include mid bass and lower mid-range frequencies; this is where the majority of a harmonica's lower frequencies reside. You can increase or decrease your BASS and TREBLE frequencies as well as lower your VOLUME to control feedback or increase your VOLUME if you want a little gain for solos. The Harp Tone+ does not eliminate feedback, but it does help control it. And it has a true bypass. 

Why 20dB in gain? The 20dB in gain for bass frequencies is necessary because they are so low in comparison to the mids and the highs that are produced in harps. They are there, but they are at a very low level. This pedal is ideal for increasing bass frequencies in your tone. It is also ideal for amps with no tone control, for increasing volume during solos, for decreasing feedback, and for giving the harp player more control over his tone when playing through a PA. 

The Harp Tone+ makes any guitar amp a good harp amp. How? By providing the gain necessary to drive bass frequencies through the low-value coupling capacitors. If feedback is a problem and the amp starts to feedback too early due to the excessive preamp gain found in all guitar amps then by lowering the VOLUME on the Tone+, you can counter that excessive gain, and now turn the amp's volume up to a much higher level where the VOLUME control setting will not be as critical in relation to feedback. Plus, if you have a speaker that is poor on bass response you will now be able to push it harder with higher-level bass frequencies and bring it to life. 

How does the Harp Tone+ make any mic a better mic? This ability is possible by the ultra high input impedance, the gain available in the bass frequency range, and the VOLUME control that helps control feedback or add volume, whichever your needs are. 

Set the volume on your amp to around 8 and then turn back (CCW) the VOLUME control on the Tone+ until feedback stops. Then set the BASS and TREBLE to your preference and fine tune your volume with the volume control on your amp. This method will help control feedback and allow you to manage feedback easier. 

The pedal can be powered with a 9V battery or a DC adapter. The DC adapter requirements are a regulated 9V DC with a minimum 100mA output and a 2.1mm x 5.5mm connector with a negative center. The battery is switched OFF when an external power adapter is used, and the "IN" jack acts as the pedal ON/OFF switch. 

  1. BASS control
  2. TREBLE control
  3. VOLUME control
  4. 9V DC input (barrel with a negative center)
  5. True bypass with LED indicator
  6. High impedance input
  7. Reverse polarity protection