Strymon Timeline

Flashback X4 has the same delay, feedback, and level knobs as the Flashback, but with 12 different delay types and four TonePrint slots. It also contains a high functioning looper, which is much easier to use than the one in the Flashback, as the X4 has record, play/pause, and play once knobs that are absent from the smaller version. But beware. This pedal is HUGE.

External Control: MIDI/EXP
Cost: $$$

HornFX Review

Interface:  4.5/5
With all of that physical space opened up, one would expect an advanced interface over its little cousin. In this respect, the X4 delivers. The dual function as looper and delay pedal are incredibly easy to use and understand. This pedal’s looper controls are quite nice. The addition of optional midi control is another game changer. It is also impressive how inviting and simple to understand this pedal is, considering how big it is.

Versatility: 4.5/5
This pedal certainly gets a versatility bump over its smaller family members due to its expanded presets and TonePrint slots. The highly usable looper gives it an extra boost as well. This is a fantastically wide ranging pedal.

Tonal Reproduction: 4/5
This pedal is another brick in the stronghold of quality tone and sonic integrity that is TC Electronics.

Complexity: High

Complexity: High

Live application: 3/5
Although this pedal does give you an amazing set of truly simple tools to use on stage, it is so goddamn big. The size truly does limit its usability, but that is still not enough to overshadow how fantastically this pedal would function on your board if space was unlimited.

InterfaceVersatilityTonal ReproductionLive ApplicationTotal Score

Product Information

Sound Design

  • Hand crafted, studio-class delay algorithms deliver meticulous, detailed and nuanced delay experiences

  • Twelve delay machines to choose from: Digital, Dual, Pattern, Reverse, Ice, Duck, Swell, Trem, Filter, Lo-fi, dTape™, dBucket™.

  • Seven front-panel tone shaping knobs: Time, Repeats, Mix, Filter, Grit, Mod Speed, Mod Depth

  • Additional menu-driven parameters deliver extremely flexible tone shaping options and complete tweakability

  • 200 easily accessible and nameable presets, save and recall at the press of a switch


  • Three rugged metal footswitches for preset selection, effect bypass, looper control, and Tap Tempo

  • LED display for preset info, BPM/time readout, and extended parameter control

  • Multi-color preset LEDs (green for active preset, amber for edited preset)

  • Full MIDI implementation allows extended control for those with more complex rigs

  • 30-second stereo Looper, routable pre- or post-delay, with MIDI capability.

  • Sturdy and lightweight gunmetal gray anodized aluminum chassis, with laser-etched artwork

  • Durable black anodized aluminum knobs

  • Studio-grade audio input and output jacks

Ins & Outs

  • Stereo input and output

  • Expression pedal input with selectable control over knob or combination of knobs, saveable per preset (also configurable as external tap input)

  • MIDI input and output

  • Switchable I/O configuration: Stereo Out or Mono with Delay Feedback Loop Insert

  • Included 9V center-negative power supply (300mA minimum required)

Audio Quality

  • Ultra low noise, high performance 24-bit 96kHz A/D and D/A converters

  • 115dB typical signal to noise

  • Analog dry path for a zero latency dry signal that is never converted to digital

  • Premium analog front end and output section

  • Super high performance DSP in a compact form factor

  • 32-bit floating point processing


  • True Bypass (electromechanical relay switching)

  • Selectable Trails mode with high quality, transparent Analog Buffered Bypass, saveable per preset

  • +/- 3dB Boost/Cut, saveable per preset

  • Selectable Tap Subdivision, saveable per preset

  • Optional Kill Dry mode mutes dry signal, for use in parallel effects loops

  • Optional Global Tap Tempo mode

  • Dimensions: 6.75″ (171mm) wide, 5.1″ (130mm) deep

  • Designed and Built in the USA

Product Information from the Strymon Website