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VOPM

Synth (FM) Plugin by Sam
MyKVRFAVORITE88WANT37
VOPM
VOPM by Sam is a Virtual Instrument Audio Plugin for macOS, Windows and Linux. It functions as a VST Plugin.
Product
Version
0.1.7
Product
Version
0.1.5
Product
Version
0.1.?
Instrument
Formats
Copy Protection
None
Open Source
Other / Unknown
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VOPM is an emulation of the Yamaha YM2151 (OPM) 4 operator FM sound chip.

Features:

  • Yamaha YM2151 (OPM) 4 operator FM sound chip emulation.
  • Supports MIDI CCs.

Latest User Reviews

Average user rating of 5.00 from 1 review
VOPM

Reviewed By Dan_E10 [all]
July 21st, 2015
Version reviewed: 1 on Windows

This is a free gem that seems to be pretty unknown outside of chip tune circles. Apparently it is not finished yet but it may be abandoned at this time. Still, the sound is excellent and it is definitely worth a try even if you have other FM VST's already.

The controls on this synth are not intuitive to figure out due to the slightly different naming conventions and abreviations and the lack of an English manual. There seems to have been an English translation at some point but the links are dead now. After watching one of the youtube tutorials on this synth everything makes sense though and it is a fairly simple synth to operate as FM synths go. The sound is excellent and really nails the 4 operator Yamaha sound. I did a comparison with a simple bass patch from an old Yamaha PSR keyboard. I tried to recreate it in VOPM, Dexed, and FM8. Surprisingly, I could only match it with VOPM no matter how long I playing with envelopes and levels. VOPM also seems to recreate by default some of the digital noise artifacts of the OPM chip. I'm not sure if these are due to aliasing or truncation due to the low resolution envelope and sine wave table lookup math. Regardless of the cause, VOPM has a grungy slightly low fi sound depending on the patch.

Dan.

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Comments & Discussion for Sam VOPM

Discussion
Discussion: Active
mridlen
mridlen
26 August 2013 at 5:08am

Here's a ton of patches (*.opm files) from Sega Genesis games: http://truechiptilldeath.com/blog/2010/05/04/opm-patches-out-of-most-genesis-games/

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mrkenallen
mrkenallen
1 March 2015 at 8:26pm

This library will not work on the Mac version because, while these are technically text files, they are Windows text files, and the Mac version of this VST only seems to understand Unix text files. The difference is DOS and Windows text files end with both the line feed and carriage return ASCII characters, where Unix text files end with just the line feed.

There are some methods of converting between the two file formats, but with more than 2600 files in this archive, anyone undertaking a conversion is in for a long slog.

BlackWinny
BlackWinny
1 March 2015 at 10:11pm

You can use this native OS X batch command quasi-unknown by the users but which works very, very well:

http://hints.macworld.com/article.php?story=20060309220909384

clbna
clbna
5 July 2015 at 6:49pm

I cant get Black Winny's command to work, can you please explain how do you convert opm files to be mac readable ?

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iridkid
iridkid
23 December 2015 at 12:20am

Do you still have link to the mac text files, Trivorak? The link is dead. Thanks.

trivorak
trivorak
29 December 2015 at 1:51am

Sorry I must have deleted the files when I cleaned out my Dropbox. The new link is this https://drive.google.com/open?id=0BxZ5LYx-MoziVzR6US1LYVRUeDA

Just and FYI i found that the AU plugin wouldn't load the files but the VST would.

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DrWashington
DrWashington
26 February 2016 at 4:30am

Here's the English manual: http://www.mediafire.com/download/kc7ub6b5zp052ds/VOPM.pdf

And, a direct link to my original thread with all the other links, lest the one below ever go away: http://www.kvraudio.com/forum/viewtopic.php?f=100&t=277864

BlackWinny
BlackWinny
26 March 2018 at 3:10pm

I have found a new 64-bit version of VOPM, for Windows as well as for OS X:

http://picopicose.com/software.html#footer

It is dated 14 January 2017.

And there is also the source code.

zklaus
zklaus
8 January 2019 at 11:23pm

Wow, thanks.

speakwithanimals
speakwithanimals
31 July 2023 at 2:09pm

you da realest.

EscapeControl
EscapeControl
12 April 2019 at 11:21pm

Does anyone know if it's possible to load opm files in a 64-bit plugin host? getting all the instruments to load only works when using a 32-bit DAW (i use fruity loops).

I tried VOPMex but it's the same problem, unless you use the 32-bit VST in a 32-bit DAW it will only load the first intrument :(.

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brickblock369
brickblock369
11 December 2021 at 9:04pm

How do I change programs (i.e. patches) in VOPM, especially when importing some OPM file that contains different FM patches?

Tried clicking on ProgNum but that doesn't seem to interact.

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