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GuitarJack - Audio Device for Compatible iOS Apps like FourTrack


GuitarJack Model 1 Interface (Discontinued)

See GuitarJack Model 2. GuitarJack Model 1 is no longer available. GuitarJack Model 1 was compatible with iPod touch (2nd and 3rd generation), and was NOT compatible with iPhone 4, iPad or iPod touch (4th generation).

GuitarJack Model 2 ($149) works with iPhone 5, iPod touch (5th gen.), iPad mini and iPad 4 using Apple's Lightning to 30-pin Adapter, which is required and sold separately. GuitarJack Model 2 also works with iPad 3, iPad 2, iPad, iPhone 4S, iPhone 4, iPhone 3GS and iPod touch (3rd and 4th gen.) with and without a CableJive 30-pin to 30-pin dockxtender cable, which is recommended and sold separately. iPod touch 2nd gen. info. GuitarJack Model 2 also offers the addition of an AD/DA converter - ready for 24-bit recording when application support is available on iPhone 4, iPad 2, iPad, and iPod touch (4th generation) and newer devices.

GuitarJack Model 1 connects a wide range of instruments, microphones, and other audio hardware to compatible iOS devices via 1/4-inch instrument and 1/8-inch stereo mic/line inputs. When used with iOS apps like FourTrack, GuitarJack Model 1 was the first dock connecting, device-powered iOS accessory to offer stereo recording; simultaneous voice and instrument recording; a 1/4 inch instrument input with configurable Pad, Lo-Z and Hi-Z modes and 60 dB of continuous level control; an 1/8 inch stereo mic/line input with configurable Pad and 60 dB of continuous level control; and an 1/8 inch stereo output with increased drive for headphones. Email Sonoma with questions. GuitarJack announcements.

GuitarJack side views

GuitarJack Model 1 Features

GuitarJack Controls in FourTrack Allow Recording in These Modes:

  • Instrument (1/4 inch) mono
  • Mic/Line (1/8 inch) mono, dual-mono or stereo
  • Both inputs, with the instrument input and the 1/8 inch input (right channel) recording to separate tracks


  • GuitarJack Model 1 is NOT compatible with iPhone 4, iPad 2, iPad, or iPod touch (4th generation). GuitarJack Model 1 is compatible with iOS 3 and later on iPod touch (2nd and 3rd generation). See GuitarJack Model 2 for compatiblility with the latest devices. Email Sonoma with questions.
  • The GuitarTone amps and effects app requires iOS 4.2 or later, and is recommended for iPhone 4, iPhone 4S or iPod touch (4th generation). GuitarTone will work with iPhone 3GS and iPod touch (3rd generation). GuitarTone is not designed to work on iPhone 3G or iPod touch (2nd generation). iPhone 3G and iPod touch (2nd generation) users may use the GuitarJack control panel in Taylor EQ (free).
  • FourTrack 5 now requires iOS 4.3 or later. iPod touch (2nd generation) and iPhone 3G cannot be updated to iOS 4.3, and will not work with the latest version of FourTrack and GuitarTone because Apple has chosen to not update the operating system on those devices.

Comparison Chart


GuitarJack Model 1 Tech Specs

Line/Headphone Output:

  • One 1/8" (3.5mm) stereo unbalanced output
  • Continuously variable gain
  • Responds to iPod volume up/down buttons
  • Specifications:
    • Maximum output level (into 16ohms): 1.23Vrms (95mW)
    • Maximum output level (into 10kohms): 1.30Vrms (+4.5dBu)
    • Frequency response (20Hz to 20kHz): +0.02/-0.20dB
    • Noise level (RMS, A-weighted): -95dB
    • Dynamic range (RMS, A-weighted): 95dB
    • THD (600mVrms into 10kohms): 0.0025% (-92dB)
    • THD (0dBV into 10kohms): 0.0036% (-89dB)
    • THD (0dBV into 32ohms): 0.026%
    • Stereo crosstalk (100Hz to 10kHz): -70dB

Line/Mic Inputs:

  • One 1/8" (3.5mm) stereo unbalanced input
  • Selectable pad
  • Continuously variable gain
  • Specifications:
    • Minimum input impedance: 4.7kohm
    • Maximum input level (pad on, line-input): 6.5Vrms (+18dBu)
    • Minimum input level (boost on, full scale mic): 7.5mVrms (-40dBu)
    • Frequency response (40Hz to 20kHz): +0.06/-0.65dB
    • Noise level (RMS, A-weighted): -88dB
    • Dynamic range (RMS, A-weighted): 88dB
    • THD (-3dBFS): 0.05% (-66dB)
    • Stereo crosstalk (1kHz): -86dB

Instrument Input:

  • One 1/4" (6.5mm) mono unbalanced input
  • Selectable pad
  • Selectable impedance
  • Continuously variable gain
  • Specifications:
    • Input impedance: 470kohm
    • Maximum instrument input level (Lo-Z Pad): 6.5Vrms (+18dBu)
    • Maximum instrument input level (Hi-Z, 1% THD): 700mVrms
    • Maximum instrument input level (Hi-Z, 10% THD): 1.5Vrms
    • Maximum instrument input level (Hi-Z, 20% THD): 2.5Vrms

Device connection

  • Apple 30-pin dock connector
  • iPod touch (2nd generation) - Made for iPod certified
  • iPod touch (3rd generation) - Made for iPod certified

Dimensions (std/metric)

  • length 2.46"/62.5mm (including 30 pin connector)
  • width 2.08"/53mm
  • height 0.62"/15.8mm
  • weight 2.25oz/65g


  • Case
    • 6061 Aluminum
    • powder coated
    • laser etched logo
  • 1/4" connector
    • Switchcraft
    • Nickel plated Brass
    • 10,000 insertion MTBF (with switchcraft plug)
  • Electronics
    • RoHS certified components

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