TR-Rack AMS

[Dean127]

I'm using the TR-Rack unit with an organ that does not have after-touch.

I have figured out how to modify programs such as solo violin (using AMS feature), so that the vibrato sound is triggered by the the key instead of by after-touch.

What I would like is for the vibrato to start after a time delay, so that the note sounds steady at first, then starts the vibrato after the note is held for a time.

Does anyone know how to program this effect?
Thanks,
Dean

[Timo]

Hi Dean, easily done, the Trinity has the best modulation capabilities in a synth, ever. It's almost limitless, like a modular synth.

Instead of using key-on to modulate the LFO used for vibrato, use an EG with a long attack to modulate the LFO, and then use key-on to modulate the EG. Hence when you press a key, the EG attack will fade in, which will in turn increase the intensity of the vibrato LFO.

If you don't understand this or you're not au fait with the programming let me know and I'll write out the settings for you.

[Dean127]

Thanks Timo.
I'm really glad to know that this can be done!

Yes, please give me more details on how to do it, because I'm new to programming and I'm using Trinitro.
I see the OSC EG in the AMS box, but I don't know where to drop it.

Thanks,
Dean

[Timo]

Right, two ways to do it, one simple, the other more long winded. Depends what you have free and available to use. They both achieve the same end result. The long winded version is slightly more flexible, however.

I'll use Trinitro as the example as you don't have the touchscreen of the Trinity.

Ok the first, simple way:


(click to view)

Click the "AMS" Editor (1). In the new Access Alternate Modulation window, click the "Intensity Mod" box (2) for the Osc 1 LFO. In the new Access Oscillator LFO window, go to the "Oscillator LFO Pitch Modulation" section (at the bottom) and increase 'Intensity' (3) to the maximum amount of vibrato you require. Then go to the "LFO Envelope" section in the same window and increase 'Fade' (4) to the length of time you desire. Longer 'Fade' settings will increase the time the vibrato takes to fade in with each keypress.

That should work. I'll also mention the second way to do it, which uses the Oscillator EG (envelope generator), but it's a bit more long winded, and you will need to make sure the EG isn't already used elsewhere in the patch or it will change the sound, but it will also enable you to create a 'fade in' and 'fade out':


(click to view)

From the beginning. Open the "AMS" Editor (1). In the new Access Alternate Modulation window drag "Osc EG" from the left hand list (2) onto the "Osc1 LFO" 'Intensity Mod' box. Then click the same box (3).
You will now see that 'Osc Env' is selected as the alternate modulation source (AMS) for the Oscillator LFO Pitch Modulation section (4), and you can set the 'AMS Int.' to something like 1.0.

While you're here, set 'Intensity' of the "Oscillator LFO Pitch Modulation" to zero (5), or in the Solo Violins' case leave it at 0.02.

Go back to the main Trinitro window and open the 'Envelope' editor from the Osc 1 tab (6).

Move the points of the graph to create a fade in and fade out of the envelope (7). Just to get you on your way, I've entered 31 for the Attack time with 30 for the Attack level, and 90 for the Decay time. This will fade the vibrato LFO quickly in to the level of 30, and then fade out slowly.

Play around with the envelope yourself. To increase the length of the fade in, just increase the Attack time. To increase the length of the fade out, increase the Decay time. To increase the maximum intensity of the vibrato, raise the Attack level.

If you want to increase or decrease the fade in/out times of the vibrato depending on how hard you hit the keys or similar, you can always alter the Velocity intensity (8 ) to a suitable value. With a positive value, the harder you hit the keys the quicker the envelope will elapse, and the softer you play the envelope will run at a normal speed. With a negative value, the harder you hit the keys the envelope will be slowed down, while playing softly will make the envelope run at a normal speed. Only use subtle increases or decreases of the Velocity value, otherwise the envelope will elapse far too quickly.

[Dean127]

Timo,
Thank you very, very much!!!! I used the simple method that you suggested and it works great!
Your description is so easy to follow and the graphics are fantastic!
Thanks again for taking the time to do this.
Dean