Yamaha CS2x Guide de dépannage télécharger pdf (Page 23)

Let’s press on: the CS2x LFO can also manipulate amplitude (i.e. volume) as well as filter and pitch. This

LFO, known as Amplitude LFO

or “LFO AMod”, is primarily used for Tremolo effects. Just so you don’t get

lost in the drudgery of grey theory, here’s another little exercise:

EXPERIMENT:

Dial-up Performance TP040; this guitar sound can be made more interesting by applying tremolo effects. To do this, call

the Amplitude LFO for both Layers into action (simultaneous edit). The modulation value shouldn’t exceed +05. You may

want to control when the tremolo effect is applied, rather than have it on all the time. In this case reset the modulation

value back to 0. Now set (say) Assign2 to control LFO-Amplitude-Modulation. Oh, by the way, we’ve already done this for

you, try playing with Knob8. Now you can freely add tremolo effects to your guitar sound whenever you want.

Are you getting familiar with the amplitude LFO? A little further experimentation should give you an even bet-

ter idea of how and when it can be used. First in line for treatment are strings and other pad sounds (TP041).

Here too natural sounding and consistent volume changes are achieved with the triangle waveform. The

sawtooth in contrast produces more distinctive rhythmic patterns (TP042) which tend to be more ornate,

however, than the comparative LFO Filter modulation.

Question: what’s even better than an LFO? Answer: two LFOs! But the CS2x though has only a single LFO.

How can we solve this?

EXPERIMENT:

Simply combine two Layers when you want to play with two LFOs. Offsetting the speeds of the two LFOs can yield sur-

prising results. Try doubling/halving the speed of the first LFO, or vice versa. Panning each Layer here left and right helps

to accentuate the interplay between both LFOs (TP043). Even “analogue echo effects” can be achieved with the LFO.

For this, the sawtooth wave is most appropriate. You will need to play “staccato” (release the keys quickly) in order to

achieve these echo effects (TP044).

Everything sounds reasonable so far. But what does Init Phase do? Don’t panic, all shall be revealed: as the

name suggests, this function is used to determine the LFO’s general phase setting. All of the CS2x Low Fre-

quency Oscillators can be synchronized to each key press using the “Retrigger” option. When this is set, a

sound’s modulation begins exactly when a key is pressed (TP045), something which is usually desirable.

Now all LFOs are running in phase, there is no variation between each separate voice. Should you wish to

involve a little randomness in this process however take a look at “Freerun” (TP046). Both examples demon-

strate nicely how the different phase settings affect a sound.

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Yamaha CS2x Guide de dépannage Page 23