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My experiments with Impulse Response (IR) processing - with sound samples!

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  • V-dubV-dub San Francisco, CA✭✭✭✭
    Posts: 325
  • edited September 2022 Posts: 5,032

    You need to copy the address as plain text. From the mobile browser you can do that by highlighting the text below the link first and then continue and highlight the link. Below should be clickable too:


    Every note wants to go somewhere-Kurt Rosenwinkel
  • DoubleWhiskyDoubleWhisky Upper FranconiaNew Vit Cach, Dupont MD60, 1940s Castelluccia
    Posts: 164

    Thanks for this post, it has inspired me to experiment a bit with impulse responses in terms of gypsy jazz guitar myself. However, I used them a little differently than @V-dub.

    I tried to get as close as possible to the Django Reinhardt solo sound of the old recordings (which of course were mostly made with one single omni mic). But I used a IR of an vintage mic which I put over my recording like a kind of EQ.

    While on this quest I found an impressive collection of free vintage microphone impulse responses here: https://micirp.blogspot.com/

    For this demo I took an IR from a vintage Shure 510C, even though there were more historically appropriate mic files on the site. In combination with the rest of my recording chain (single SM58 dynamic mic in an acoustically untreated room), the 510C sounded closest to the original recording to my ears. The guitar I used is a Dupont MD60. I'll See You in My Dreams I chose because that's what I'm currently transcribing. The fade out is there because that's the current state, haha.



    djazzyBuco
  • edited October 2022 Posts: 5,032

    That sounds nice but can you record something with a guitar isolated because Django's sound in the background is doing a trick on my ears and can't quite focus on your guitar. Great idea, love it. Also impressive vibrato there, I'm jealous.

    djazzywim
    Every note wants to go somewhere-Kurt Rosenwinkel
  • DoubleWhiskyDoubleWhisky Upper FranconiaNew Vit Cach, Dupont MD60, 1940s Castelluccia
    Posts: 164

    Thank you! Regarding the tremolo...I recorded it at 0.75 speed and speeded it up again because i wanted to see if I could get that "rushed" old film effect like that. So the tremolo for sure is a bit exaggerated haha.


    I made a quick video with guitar only for better judgement. Doesn't sound very good on itself but I think in a full mix it really has that vintage vibe:



    djazzyBucoScoredog
  • Posts: 5,032

    Huh, that actually tells me that you could practice it just like that. Start slow-er and then go to tempo. My vibrato (vibrato, tremolo?) is getting closer but I don't think I ever approached practicing it like that.

    The sound is actually great! Wow, nice work man.

    DoubleWhisky
    Every note wants to go somewhere-Kurt Rosenwinkel
  • DoubleWhiskyDoubleWhisky Upper FranconiaNew Vit Cach, Dupont MD60, 1940s Castelluccia
    edited October 2022 Posts: 164

    Thank you! And yes, I think this can be a good way to practice the vibrato. I bend all the time with vibrato when playing electric so it's one of the very few things I didn't have to learn from scratch regarding gypsy guitar haha. Can you give a example of what typ of vibrato it is exactly that you are struggling with?

    And you are absolutely right! It's Vibrato, not tremolo. Even though I think I do know the difference I mix the terms up all the time haha. I guess that's because of my electric background. We can thank Leo Fender for that, because he named the vibrato bar "tremolo" on the stratocaster. Funny enough tremolo as far as I know can refer to two different things, even when used correctly: 1. for very fast strumming like in tremolo picking or 2. for a effect that alters the amplitude of the signal. But if we take the latter in the example of a brownface era Fender amp the tremolo effect actually is more of a vibrato than a technical tremolo so...

  • Posts: 5,032

    Yeah I only mentioned it because I know people interchange the two terms all the time. I just read a Wiki page on tremolo and it says too that the term is misnamed as used in relation to the whammy bar. It says, and it makes sense, that tremolo doesn't change the pitch, only the amplitude of sound. Vibrato on the other hand, refers to change in pitch. In string instruments, tremolo is also a rapid bow movement or rapid picking. I can see how overlap happens when tremolo term is used to describe something that changes the amplitude, like for example Leslie rotary speaker. This type of sound can be easily confused with vibrato effect.

    Regarding my vibrato, I'm happy with where it's at now. At some point it just happened. It was actually a bit of surprise for me, like how could I all of a sudden move my finger so rapidly. I did practice it but never felt it was some sort of structured practice like other stuff I do. It's natural though, the more you do something and as long as you have some sort of goal in mind, the brain eventually paves that road. Still I will spend some time slowing down the osculation of the pitch change (tryin' to be technically correct here...), like you did to record that. It really sounds fantastic, spot on Django. You mentioned the effect of old film... which makes me wonder if what we see Django doing in Jattendrai video would look the same in person? Because, for example, Stochelo's vibrato looks incredibly amazing but it's still not as musical as Django's. Was he trying to get it the way it looks in Django's old film?

    I reread your original post...do you use an IR pedal or you just applied an IR file to a regular recording? Which I didn't know you can do that...can you?

    TonyRees
    Every note wants to go somewhere-Kurt Rosenwinkel
  • ScoredogScoredog Santa Barbara, Ca✭✭✭✭
    Posts: 904

    I think the model sounds very good too

  • ChristopheCaringtonChristopheCarington San Francisco, CA USANew Dupont MD50 Custom
    Posts: 187

    I feel like this is the "each improvement gets me 2% better, but they add up." I totally agree with you the guitar sounds bad by itself, but that tone is great for mixing.

    However, I love the idea that you recorded with a modern mic then layered in an impulse response over it. The idea that you record hi-fi to make sure everything is corrected and mixed, then throwing an impulse response on the tracks like a video LUT just makes so much sense. Especially because recording with vintage equipment can be a nightmare.

    DoubleWhiskyBuco
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