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Roland E-4 AIRA Compact Voice Tweaker

Affordable Vocal Transformation



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SKU: E-4

Product Description

Roland's E-4 Voice Tweaker is an essential, affordable tool for any creative live vocalist. Take your voice to new heights using a variety of premium effects, an integrated looper and transformative vocal functions and add excitement and dynamism to any show. 

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Key Features 

  • Vocal performance unit equipped with voice transforming effects 
  • Use format and pitch sliders to tweak your sound 
  • Optional BOSS TRS MIDI cables allow you to hook up to any other AIRA Compact
  • Rugged construction and controls 
  • 3.5 hours of use per charge via the integrated lithium-ion battery 
  • Class-compliant MIDI and USB-C audio interface - no driver installation required 
  • MIDI, audio and sync I/O with additional AIRA Link 
  • Utilise the Scatter knob to conjure interesting percussive effects 
  • Harmony, vocoder and Auto Pitch vocal effects
  • Headphones output
  • Inline mic support 
  • 1/4-inch mic input (featuring a broad gain control)
  • Take charge of harmony, vocoder and pitch parameters via external MIDI control 
  • 24-second looper (offering instant BPM detection, undo/redo and unlimited overdubbing) 
  • Remove undesired sounds using a noise gate and low-cut filter 
  • Use techo, tempo delay, chorus and reverb to process your audio output 

Vocals on the Road  

The E-4 isn't just reserved for the stage. Thanks to 3.5 hours of run time on a single charge via an onboard lithium-ion battery, you can get experimenting whenever and wherever inspiration strikes! 

AIRA Compatibility 

Connect the E-4 to the J-6 Chord Synth or the T-8 Beat Machine for even more sonic scope. You can also hook up a headset, handheld mic, or use the inline mic on a pair of earphones to perform exactly how you like! USB-C and MIDI connectivity ensure that the E-4 can interface with apps, external hardware instruments and your favourite DAW too.


Dissect your sounds, cut it into slices, and tweak it all with a simple turn of the intuitive Scatter knob. Or, why not apply layers of your voice via overdubbed effects and loop it with the 24-second looper.

Vocal Soundscapes

By harnessing the in-built arsenal of trigger looper controls, sonic shapers and Scatter effects - alongside format, pitch and other alterable settings - you can transform your voice in either futuristic, or more traditional ways. For example, why not add some robotic flair, or change the gender of your vocal entirely!

That's not all; instant harmony effects, such as chord and key voicing changes, plus Auto Pitch let you craft a vocal sound influenced by the greatest modern day chart music. 


Effect Type


Maximum Recording Time

  • Approximately 24 seconds


  • 7 segments, 4 characters (LED)


  • SYNC (IN, OUT) jacks: Miniature phone type
  • MIX (IN, OUT) / HEADSET jacks: Stereo miniature phone type (Stereo, CTIA)
  • MIDI (IN, OUT) jacks: Stereo miniature phone type
  • MIC IN jack: Stereo phone type
  • USB port: USB Type-C®  (Audio, MIDI)

Power Supply

  • Rechargeable lithium-ion battery
  • Obtained via USB port (USB bus power)

Current Draw

  • 500 mA

Expected battery life under continuous use

  • Approx. 3.5 hours
  • (These figures will vary depending on the actual conditions of use.)

Expected battery charging time

  • Approx. 3 hours
  • To charge the unit,  use the USB port of a computer or a commercially available USB power supply adaptor (5 V, 500 mA or higher).


  • 188 (W) x 106.5 (D) x 41.7 (H) mm
  • 7-7/16 (W) x 4-1/4 (D) x 1-11/16 (H) inches

Weight (including batteries)

  • 290 g
  • 11 oz


  • Leaflet ”Read Me First”
  • USB Type-C to USB Type-A cable

Written by Will Brook-Jones


Customer Reviews


3 reviews





Trusted Customer23rd Dec 2023

Value 5Looks 5Durability 5Sound 5

Trusted Customer26th Jul 2022

Great little vocal processing box that has a big sound and lots of features for the price

Value 5Looks 5Durability 4Sound 5

Trusted Customer9th Jun 2022

Pretty good, shame the mix audio in can’t be captured by looper though.

Value 4Looks 4Durability 4Sound 4

Finance available at checkout for orders £300+

How do I use instant finance?

It's simple! Just add the products you want to your basket and click the "Checkout" button in your basket. Go through the checkout process and tick the "Finance" option under "Select Your Payment Method". You can then choose which finance term you'd like to apply for, and change your deposit if you wish.

At the end of the checkout you'll be taken to the V12 Finance web site. This is where your finance application is processed. Assuming your application is accepted you'll be able to place your deposit and confirm your order right there.

Then, your order will come through to Andertons and we'll send you the goods. Get approval before 3pm and we'll send your order out the same working day (stock permitting) for next working day delivery!

Who can apply for finance?

You must: spend over £300, be at least 18 years of age, have been a UK resident for 3 years or more, be able to make repayments by Direct Debit, be in regular employment (minimum of 16 hours per week) including self-employment, or in permanent residence with your partner who is in regular employment.

Read More About Online Finance

Andertons Music Company's Registered Office: 58-59 Woodbridge Road, Guildford, GU1 4RF. Andertons Music Company acts as a credit broker and not a lender and only offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance. Not all products offered by Secure Trust Bank PLC are regulated by the Financial Conduct Authority. Andertons Music Company is authorised and regulated by the Financial Conduct Authority, firm registration number 716155. Credit provided subject to age and status.