| Developer | Sono Elements |
|---|---|
| Released | 7 April 2019 (press announcements 8 April 2019) |
| Instrument type | Sample-based Mellotron emulation |
| Sounds | 17, multi-sampled |
| Formats | VST and AU instrument (KVR Audio also lists VST3) |
| Systems (original page) | Windows 7, 8, 10 and macOS |
| Launch price | US$29 |
| Status (checked 3 Nov 2026) | No longer sold; original store page gone |
Overview
eTron Pro was the expanded edition of eTron, announced in early April 2019. The idea was unchanged: the sound of the Mellotron tape keyboard behind a small, plain interface. What changed was scope. Where eTron offered seven sounds, eTron Pro offered seventeen, and press coverage at the time described them as multi-sampled.
The extra sounds went well beyond the standard strings, flutes and choirs. The list in the developer’s manual includes a boys’ choir, an Orthodox choir and a combined choir, solo and duo violins, a trombone, a lo-fi flute and a flute variation, plus two effects-style sounds, a siren and a gong. Mellotron tape libraries always included odd extras like these, and they were part of the instrument’s appeal.
The engine was the same one eTron users knew: pregain, an amplitude envelope, stereo tremolo, a low-pass filter, a room reverb and a “lo-fi noises” section with vinyl crackle, tape hiss and hum. eTron Pro sold for US$29, ten dollars more than the original, which remained available.
About this page: the Wayback Machine never saved the original eTron Pro article, but Common Crawl, another public web archive, recorded it on 22 April 2019. That copy confirms the publication date, the US$29 price, the feature list and the demo track used below. The wording and images here are new; the sound list and controls come from the developer’s manual, listed under Sources.
Hear for yourself
eTron Pro demo: “Adagio for Trons”
This is the SoundCloud track embedded in the original article, which said no external effects were used. The developer also uploaded the demo to the Internet Archive alongside the manual.
The recording belongs to the developer and is hosted by SoundCloud. Nothing is loaded from soundcloud.com until you click; after that, SoundCloud may set its own cookies (see the privacy policy). Open it on SoundCloud.User Interface
According to its manual, eTron Pro kept eTron’s one-window layout with the same groups of controls. The diagram below is drawn from that description.
- Sound selector: arrows step through all seventeen sounds.
- Pregain: balances the selected sound against the instrument’s output; pushed to maximum it distorts on purpose.
- Tremolo: stereo, widening as the depth increases.
- Effects and noise: room reverb, low-pass filter, and vinyl, tape and hum layers for an older, more organic tone.
Features
- Seventeen multi-sampled Mellotron sounds
- Amplitude ADSR envelope
- Stereo tremolo, low-pass filter and room reverb
- Lo-fi noise section: vinyl crackle, tape hiss and electrical hum
- Main parameters controllable by MIDI CC (list in the FAQ)
- VST and AU instrument for Windows and macOS
Sounds
- Flute
- Flute variation
- Lo-fi flute
- Cello
- Strings
- Violin duo
- Violin solo
- Brass
- Trombone
- Woodwinds
- Choir 1 (men)
- Choir 2 (women)
- Boys choir
- Combined choir
- Orthodox choir
- Siren
- Gong
System requirements
- Windows 7 or 10, or macOS High Sierra or later
- At least 300 MB of free disk space
- At least 1 GB of RAM
- A VST or AU host (DAW)
- Intel Core i5 at 1 GHz or better
Manual
eTron Pro User Manual, demo and screenshot (Internet Archive item)
The original article’s manual link (a bit.ly short link) still redirects to this upload. The developer’s item from 8 April 2019 holds the manual (PDF, about 1.7 MB), the audio demo in several bit rates, a screenshot and the box art.
Purchase
At launch eTron Pro cost US$29 and was sold through a Gumroad store page linked from the original article. That store page no longer exists: the link returned “not found” when this archive checked it on 3 November 2026. As far as this archive can tell, the plugin is no longer on sale anywhere.
This site does not sell eTron Pro. It cannot issue licences, resend downloads, process refunds or look up past orders, because it is not run by the developer. See the FAQ for what we do and do not know.
By 2020 the other product pages warned that the plugins did not yet work on macOS Catalina (10.15) and promised an update. The only captures of the eTron Pro page date from April and June 2019, before Catalina came out, so it is not known whether this page later carried the same warning. This archive has no information about later macOS versions or Apple silicon Macs.
Sources
- KVR Audio: Sono Elements releases eTron Pro (8 Apr 2019)
- Sonicstate: Another Mellotron virtual instrument (12 Apr 2019)
- eTron Pro manual, demo and screenshot, uploaded by the developer (Internet Archive)
- Original article, captured 22 Apr 2019 (Common Crawl index record)
- eTron Pro demo “Adagio For Trons” (developer’s SoundCloud)
- Nov 2020 capture showing the link to this page (Wayback Machine)
Original page: Common Crawl capture of 22 April 2019 (index record; Common Crawl has no public page viewer). The Wayback Machine never captured this URL; Common Crawl’s next visit, in June 2019, found the page unchanged. Release date source: Date on the original article (Common Crawl capture of 22 Apr 2019); press announcements and the developer’s Internet Archive upload followed on 8 Apr 2019. This page was written on 2 November 2026 in new words and revised on 3 November 2026; facts were checked against the sources above.
