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bad ass....

PostPosted: Sun Oct 05, 2003 12:28 am
by sampleandhold
okay... this is more for those who are just getting into sound design and there emu's. this is a fairly simple bass patch that you can make on your emus with just one voice. the idea here is to create something more from something simple. get your minds going. The bass is going to sound something like the bass in "bad ass" from Aphrodite and Mickey Finn...

what you are going to do is have to sample your test tones, or use a wave generator to produce a sine wave. sample it and set up loop points and so on and so fouth.

okay.. you may need to adjust the attack of your sound because it may click depending on if the cycle starts slightly above the zero crossing. an attack of 5 in the amp envelope section should cover the click and still have the appearance of starting on time... no real delay.

now we go into the matrix mod screen: keep cord 00 as it is.
cord 01 is going to be set up like this:

aenv+>pitch>+20

cord 02 is:

lfo1~>pitch>+11

well, that is it. you are done with the mod screen. now go and high light "aenv+" and select that. you should now be in the auxuillary envelope screen. set this envelope as follows.

atk1 0 100 atk2 45 -75
dcy1 0 -75 dcy2 0 -75
rls1 20 -75 rls2 0 -75

what we have now set up is an envelope that is going to control the pitch over time. when you hit and hold your controller's key you should hear it pitch down slowly over time and then finally stop and hold at a certian point. this is going to be a subtle effect...

now go into your lfo1 edit screen and set up as follows...

lfo1
rate 8.53
shape sine
delay 0
variation 0%

now when you hit the key you should hear a slight wobble to the bass and it should slowly pitch down as it wobbles. just like in "bad ass" it is kind of cool. i always like that song...

problem: so this is what mind mech was talking about. in the higher registries of this patch, if you use only one sample (perhaps sampling the wave at octave intervals could remedy this) you will hear clicking. it almost sounds like destortion but is in fact the sampler having difficulties keeping the loop stable since there is an lfo moving the length all over the place. this is one solution the problem, but may not work well with other tones that contain over tones.

since my patch has this problem i went into the filter frequency edit screen. i moved the filter to 6 pole and set the frequency at 9138hz. this removed the clicking that was appearant and didn't effect the sine at all. but of course if you go really high in this patch, you will eventually start hearing the notes get softer and softer as you pass whatever key 9138 is at. but every note under that is uneffected and you will have quite a large area to work in. anyway you are going to use this for bass right.

now something to do is normalize your sine, then boost it just one more time by 1 db. you will have a slightly distorted sine. this will change the timbre of the sound by alot. you may dig this even more with the patch as it is. play aroung with it. set the aenv percent to 100 percent and hear that. change the lfo to a different shapes and percentages. how about this: use your auxenvelope as a kind of step sequencer. you can make the patch change pitch in steps.

have fun with it.

PostPosted: Sun Oct 05, 2003 1:53 am
by sampleandhold
glad you dig it....

one thing with over gaining your waves. if you do anything with over tones. like a square (really, distortion on a square, what is the difference) or a triangle wave, you will have to normalize, then boost again by 6 db, and then you should be able to finally get distrotion out of the wave. since the sine is a pure tone, once you go over normal you are cliping and there will be arifacts. on other sounds, you normalize, then you boost again and even though you are cliping it, you still have about 6 db of transients that will clip but actualy not have any artifacts.

try this once you have your track mastered and you are recording it. normalize it. compress it then boost it by six more db. you should get an even louder recording with out distrotion.

PostPosted: Sun Oct 05, 2003 3:02 am
by sampleandhold
i am sure someone will beat me to this, but i am not sure. i really haven't played too much with lfo until now. i think the insturction manual tells what the difference is. but i can't remember. i will have to look it up tonight.

PostPosted: Sun Oct 05, 2003 11:43 pm
by phono
afaik LFO~ sweeps through positve and negative values whereas LFO+ only sweeps through positive values ;)

PostPosted: Mon Oct 06, 2003 12:02 am
by ezman
from Page 351 of the EOS 4 manual.
+modulation ADDS to the intial value (range 0 to 127)
~centres around zero (use for LFO's, Filt Freq) (range -63 to +64)
>modulation subtracts form the initial value (range -127 to 0)

PostPosted: Mon Oct 06, 2003 12:54 am
by sampleandhold
see? i told you :mrgreen: