Convert Recorded Samples to synth models? (if possible for the convenience of the users)

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Convert Recorded Samples to synth models? (if possible for the convenience of the users)

Postby rosesbyrosex » Thu Jan 11, 2018 4:19 am

If you have seen my previous post on this forum you may notice that i am an audio software enthusiast, im always on the latest audio plugins, trying new stuff
Recently i noticed a a growing trend of using modeled instruments that started with the launch of MODO BASS wich became a best seller in just a few days, modeled intruments are not new, some of us use partially modeled intruments (like H7S,Ample Sound Series, Some Kontakt...) and i mean partially because although the execution/playing (like strumming) of the instrument is modeled, the sound is generated via recorded samples and not models.

The most trending modeled instruments are the Physical modeled ones (i mean not just the normal modeled instrument synth, but also the physics models wich are a pain to implement [eight years took the development of the MODO BASS plugin]):
Note: there are lots of modeled instruments out there, even a modeled hurdy gurdy vst plugin, but only a few of them are Physical modeled.

Here are some advantages of Modeled Intruments over Sample Based:

Modeled: Small Size (5 to 10 mb average)
Sample Based: As Big the Sample Library Is The best quality (From 1 to 60 Gb average)

Modeled: Sound Models are very small programs and are being loaded on ram ( from 2 mb to 10 mb average)
Sample Based: Samples tend to be loaded on Ram so as big the sample library will also be the ram usage (from 1 to 2 gigabytes average)

Modeled: Very Small
Sample Based: Very High Specially when loading samples at startup (90% average) [REDUCES THE HARD DRIVE LIFETIME]

Variation Realism
Modeled: Automatic Model Randomization (Not repited sounds)
Sample Based: Round Robins (Wich greatly increase library size) (Samples are repited depending on the Round robin cycle length)

CPU USAGE (They are almost the same when program is loaded)
Modeled: Low Cpu just to generate audio from models.
Sample Based: some extra use of cpu usage when loading samples from disk and managing/releasing/cleaning New/Old samples from ram/system

Modeled: depending on how many components the model is divided on, it can be more customized, for example pickups models, pickup selector, type of strings.. lots of possibilities models can be combined one on the top of other.
Sample Based: limited, it can be done using diferent sample banks recorded with diferent configurations like H7S Drop A feature changing the sample bank of the 7th string

Modeled: Because of the small size of audio models you can include them in your main installer
Sample Based: Two individual installers, one for the sampler engine and another for the sample library

Physical modeling isn't a easy thing (Modo Bass, Pianoteq,Swam), but models can be done in different ways, do you think that would be possible to convert the H7S sample library (9.07 gigabytes on disk) to synth models? i mean without physical modeling or individual component modeling, so it will be lightweight, and could it be done without reducing sound quality?.

Thank You Very Much
Posts: 48
Joined: Thu Jul 21, 2016 9:28 am

Re: Convert Recorded Samples to synth models? (if possible for the convenience of the users)

Postby jiandingzhe » Thu Jan 11, 2018 6:47 am

We know that the model based synthesizers are superior in several aspects: they are much smaller, and are more adjustable than sample-based instruments. However, at current we do not have enough knowledge to build a model-based virtual guitar, especially all the algorithms need to be run at real-time with very low CPU consumption.

Nevertheless, we still used some techniques to modulate the raw samples. For instance, the harmonics are dynamically tuned according to playing velocity and pitch shift. These techniques produced more RRs and pitches than the number of actually recorded ones, and reduced the number of samples to ~ 1/10.

In near future, we are going to release two more virtual guitars. They will use more advanced DSP technologies, and we are planning to further reduce the number of RRs and the density of recorded samples among pitches, in exchange of smaller sample size and more performances.

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