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GForce The Streetly Tapes Vol. 2 Expansion for M-Tron Pro

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Quick Overview

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Key Features

A GForce Software and Streetly Electronics collaboration
Tape banks from the original UK 'Tron masters
Derived from original EMI tape-stock
24 carefully curated sounds for M-Tron Pro
35 notes per tape bank
Exclusively available via download - 600MB
100s of patches, many from luminaries including Jem Godfrey (Frost), Dave Spiers and Tony Durkin.



descriptions by Martin Smith, Streetly Electronics.

Combined Choir - A vast compelling ensemble of men, ladies and boys going AHH!

Cor Anglais - Gorgeous reedy gentleness.

Cymbals & Marimba - An odd and rare selection of percussiveness for the bottom 5 notes before a gentle, rumbling lo-fi marimba.

12 Violins - The origin of these edgy violin recordings is unclear but we think they originated at Strawberry Studios and may well have been organised by Mr. Godfrey of The Enid fame. Of course, this could just be two spherical objects in a bag! 

Fairlight Arr - Instantly recognisable, a popular Fairlight preset. All 4 bit and grundgy.

Fairlight Sax - Another famous Fairlight voice that fits nicely in the mellotron canon.

Italian Accordion - Just right for advertising a new deep pan pizza with a Snickers bar in the crust.

Lowrey Thru Leslie - A wonderfully cheesey organ.

M300B Violins - A gem! This is a solo violin recording which can best be heard on Watching and Waiting by the Moodies. Very warm and melancholic.

M400 Vibes - A bright recording with good attack to each and every note with a gentle vibrato. A classic.

Male Choir - Four gentlemen in unison down the Dog and Doublet toilets.

Medieval Woodwind - Bassoon, Oboe, Flute and Clarinet summoning up memories of plague, famine and pestilence, Shakespearian style. No crumhorns were injured.

Miller Brass - Dear old Glenn, who successfully transplanted saxophones with clarinets and gave birth to THAT sound. This is a mellotronic tribute.

Moog Trumpet - A Minimoog farting after one too many lagers.

Oboe - A Tangerine Dream fave. Just check out Rubycon. Very effective for a lead line but a chordal cluster sounds like traffic jam in Milan.

Orchestra - A Les Bradley mix and one of many probably as Les used to do these on the fly when requested. We just happen to have this one documented for all time.

Pinder Smooth Organ - The lovely Mike Pinder used to create fabulous pitch slides with this warm and evocative sound. You will hear it used in this way on many of the core 7 Moody Blues albums.

Rhodes - Not that well known, this is a strangely effective and compelling Rhodes rendition from the output of our Skellotron.

String Section No Cello - This is the old String Section after a calorie controlled diet having shed some weight. Powerful nonetheless.

Ted Taylor Choir - This is a weird recording that lacks clarity from the start but if you want a dense vocal sound deep in the mix, this could be the very thing for you.

MKII Violins - THE MOST FAMOUS SOUND EVER! This is why you all love Mellotrons. This is why we are here. This is why you are reading this now. If there was one sound that defines all our obsessions with the ‘Tron, this is it.

Trombone - In Britain back in the '60s we had a TV celebrity named George Chisholm. He was a comedy trombonist. Try pitching that to an executive at the BBC. George was also a celebrated jazz musician and this is his trombone rasping down a microphone circa 1963. Listen to Bungalow Bill and Flying by the Beatles, whoever they were!

Two Trombones & Trumpets - George Chisholm again, doubled. The trumpet player remains incognito.

Viola - A very close miked Viola. A little too close maybe. Maybe the engineer and the player were having a fling. we'll never know but a very useful recording came out of their sordid affair.



Instrument Overview


Streetly Tapes for M-Tron Pro Vol2 is the perfect compliment to the previous Vol1 Expansion Pack and in our opinion is an essential add-on for all M-Tron Pro owners.

Curated from the original Mellotron® tape archives, Volume 2 combines a mixture of rare gems and definitive versions of celebrated, legendary and renowned tones, designed to breathe life into your compositions 8 seconds at a time.

If you already own The Streetly Tapes Vol 1 for M-Tron Pro you will have read of the discussion that took place between GForce and Streetly Electronics which focussed around Streetly Electronics providing their original tapes for use in M-Tron Pro. To say we were excited was an understatement because, not only would this grant us access to the definitive 'tron tape collection previously available only to owners of the original instruments, during the process we would also be able to pick the brains of arguably the two most knowledgeable people on the planet, regarding all things Mellotronic, Streetly's John Bradley and Martin Smith.

Finally we would be able to separate myth and folklore from fact, especially given that John Bradley is the son of the late Les Bradley, who in turn was one of three brothers that ran a family business under the name Bradmatic Ltd manufacturing, amongst other things, magnetic tape heads who went on to produce the first Mellotrons.

In the early 1960s Bradmatic was approached by an American, Bill Fransen, who asked if the company could supply a large quantity of matched tape heads. Intruiged by such an enquiry the Bradley Brothers met Bill Fransen and discovered that it was for a keyboard instrument based around a tape replay mechanism. The concept was that under each note was a piece of tape which, when pressed, replayed the recording of a real instrument such as violins, flutes etc. And the truth was that, despite some fundamental engineering flaws, the Bradley brothers were impressed enough to agree to improve the design and also to mass produce this machine.

Believing that the instrument was all Bill's idea, the Bradley Brothers procured financial backing from entrepreneur Eric Robinson and magician David Nixon and set to building their own improved version. During this process the name changed from the Franson to Mellotrone before finally settling on the name we all know today… the Mellotron.

On its release, the Mellotron became a huge success and thanks mainly to its magnificent sound, was adopted by The Beatles, The Rolling Stones, The Moody Blues, Graham Bond and others. Sadly though, all was not as it appeared and it transpired that Bill Fransen didn't actually own the rights to the instrument at all. In fact he was essentially a salesman for a Californian inventor, Harry Chamberlin, who had created the entire tape reply instrument
genre under the name Chamberlin.

It took a few years but in 1966 as soon as the Bradley's discovered that Fransen hadn't been strictly honest with them and they were infringing on Chamberlin's Patent and Intellectual Property, they invited Harry to the UK and eventually agreed to pay Harry somewhere in the region of £60,000 a huge sum of money back then, equivalent to nearly £1,000,000 in 2013.

With Fransen's dark secret out of the closet though, the Mellotron went on to change the face of music forever and it's with this lineage and John Bradley's heritage in mind that we're immensely proud to be able to bring you this collection of sounds for M-Tron Pro.

So what is the secret to the true Tron sound?

Obviously, it goes without saying that each note of each sound must be recorded separately and any so-called 'tron' that eschews this in favour of a single sample covering groups of notes should be shunned and its creator burned at the stake. We've made our feelings very clear on both this and the concept of looping 'tron sounds, and given Streetly felt the same way, we knew we were at least on the same page when it came to those major points.

However, according to Streetly, it goes deeper than that.

Firstly, it’s the EMI tape, which they claim is the best tape formula in the world because it doesn't shed oxide and it has the original eq characteristics for THAT sound!

Secondly, Martin Smith insists “The sound of a 'tron is not the master tapes, it’s the sound from the original recordings made in IBC studios edited to Master Tapes, edited to Copy Masters, edited to Work Masters which were then used to generate the tapes on your machine"

Finally, it’s both of these things played across a properly aligned tape-head and recorded via an instrument’s preamp.

To facilitate this, all the sounds were recorded via the Streetly Electronic's Skellotron, an exoskeletal Mellotron which allows easy access to azimuth adjustment and tape alignment for each tape and sound set. Note-by-note recordings from this unique instrument were then transferred to M-Tron Pro format before being cross referenced against their benchmark M4000 by Martin and John for final approval.

The entire process may have been lengthy and painstaking but the result is a library that is completely unique and utterly authentic

Legal Notice
All product names used in this product are trademarks of their respective owners and are in no way associated or affiliated with GForce Software Ltd. These trademarks of other manufacturers are used solely to identify the products of those manufacturers whose tones and sounds were studied and or recorded during development of this product.


Works With


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M-Tron Pro Expansion Packs are only available to registered users of M-Tron Pro. Additionally, they are exclusively available as direct downloads at

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The Original Instrument

While we love and admire the engineering of the original hardware machines, we also think hardware and good software should sit side-by-side. Because although the hardware versus software debate still rages, ad nauseam, the simple truth is that there's no definitive answer as to which is best. Just as there is good and bad hardware, there is good and bad software and the answer to this conundrum will depend on all manner of things including your personal perspective, available space, your technical savvy, your preferred working environment and of course your finances.

For example, do the majority of musicians looking for ‘that sound’ really care to maintain a forty-plus year old instrument, sourcing rare parts when they wear out or break?

Naturally we care, because we feel that we’re custodians of these instruments and while many other software companies simply hire-in instruments to record or model, we consider this bad practice. In our opinion good practice is when you've lived with and loved the original instrument's character and foibles for a considerable time before beginning any emulative process. Because, then and only then, do you stand a chance of capturing some of the instrument's soul and character within the software alchemy.

It's a simple dogma but you'd be surprised at how many software companies ignore this in favour of marketing hyperbole. Indeed, when we explained our philosophy to the marketing director of one such company, he said "No one really cares" and strolled off to no doubt perpetrate more marketing myths.

For us that fundamental understanding and love for an instrument is what really matters when trying to transplant its character. You see, we can tell the difference between good or bad, lazy or indifferent, marketing bullshit versus a real love for the authentic, because we’ve been immersed in these instruments for over 30 years. And in the case of Streetly, over 50 years!

But ponder this - while we’ve thrown countless bags of money at the purchasing and maintenance of all manner of tape replay instruments from Chamberlin’s to Mellotrons, we’re the exception. We’re committed (some would say ‘certifiable’) and we do it so that you don’t have to.

If you want an M400 plus all the tapes we supplied with the M-Tron Pro, you'd be looking at £20,000 plus, as opposed to the M-Tron Pro's £140. Likewise, if you wanted to buy the physical tape frames of a Streetly Tapes Volume for your original M400 you’d be looking at a price tag of at least £5,000, whereas at 1% of that each Streetly Tape Volume represent amazing value for money.

It’s something worth bearing in mind the next time that someone tells you that hardware is better than software.