sketchbook: faking guitars

As someone that plays keyboards I’ve been mostly resigned to the fact that I can’t put guitars in any of my tracks, but after some playing with guitar samples available at the Flame Studios website, I’m cautiously optimistic. Flame Studios has high-quality recordings of various guitars (like the Fender Telecaster and Gibson Les Paul) in GigaStudio format, and when used appropriately, they sound great. Their website has been down for most of the last few years, but I’m hoping that it’s now back for good.

Most of the recordings are straight from the guitar’s line-out, which I think is ideal: if you want a clean sound, you can use it as-is, or you can run it through your choice of amp simulation to get a more typical guitar sound (something I’ve always been curious about but never had a chance to try). I was testing the samples using the Linuxsampler LV2 plugin in an Ardour 3 MIDI track, so I decided to try Guitarix, which as of version 0.25 includes some pre-built combinations of tube amp, tonestack, and cabinet as LV2 plugins.

The new Guitarix LV2 plugins, alongside some old favourites

The new Guitarix LV2 plugins, alongside some old favourites

So far, I’ve been quite impressed with Guitarix. I haven’t had much experience with amp simulations, but even so, with appropriate twiddling of knobs I’ve been able to get some crunchy distorted sounds, and some cleaner sounds that add a lot of character without over-the-top distortion. There are other options — Rakarrack has some amp/cabinet simulation features (though it focuses more on effects), and the C* Audio Plugin Suite provides amp/cabinet simulations as LADSPA plugins — but the simplicity and quality of the Guitarix LV2 plugins won me over.

The sound itself is just one piece of the puzzle — the other is to play things in a believable way. Keyboards can do a lot of things that guitars can’t, so you have to limit yourself playing parts that at least sound like they would be possible on a guitar. Arpeggios with wide gaps between notes are an easy cheat, but if you want to play chords, a list of guitar chords mapped out on the keyboard, like this one, is very helpful.

Of course, the reverse is true, too — guitars can do a lot of things that keyboards can’t. Many of the Flame Studios guitars include extra samples of finger slides and other guitar sounds beyond just the notes, which you can sprinkle in to a part to add some realism. Subtle MIDI pitch bends can help add some expression, too, though they really stand out if they’re done poorly. You’re not going to be able to capture the subtlety and nuance of a real guitar, but with a bit of care, I think you can definitely create basic guitar parts that sound convincing enough to work in a mix.

On to the sketch! Using the Telecaster line-in sample set recorded from the bridge pick-up, I came up with a simple little arpeggio-ish riff thing, and then tried running it through various Guitarix settings. In the sketch you hear three versions of this riff: the first is completely clean, the second uses the Guitarix GxAmplifier-IV plugin with fairly heavy drive settings and a CAPS Plate reverb, and the third uses the GxAmplifier-II plugin with much cleaner settings, along with a Calf Vintage Delay, dRowAudio Flanger, and the CAPS Plate reverb again.

mp3 | vorbis | 1:07

sketchbook: not-quite-guitar

I’ve never learned to play guitar, but I wondered the other day if I could synthesise something similar to the sound of a distorted electric guitar, and I don’t think this sketch is too far off. The raw sound is from the Blofeld, and is very vaguely guitarish, but running it through a guitar amp/cabinet sim on the PC adds that distorted character to it.

20090920: 34 seconds