Basic Reason NNXT – Filters

Welcome to another short video tutorial using the NNXT sampler in reason. I’m Dan Halford, and this time we’re
going to be looking at filtering. So, I have the Rooster sample with a
loop running on it the like that and we’ll look at where the controls are and what they are for the filter, so, they are down in this box-out bottom right hand
side of the remote programer for the NNXT and you can see you’ve got frequency
control here, and resonance control here keyboard tracking (which we will ignore for the moment) a number of filter orders here and an on/off control simply switching that on and off. OK so before we
hear what that sounds like some theory… OK so filters our devices that effect the
spectral response of a sound so we plot them we plot their response on amplitude/frequency graph like this and so the graphs lower axes runs from low to
high frequencies from left to right and the amplitude is showing from a nominal gain level here which I’ll mark on as a dotted line. Filters tend to
just be cutting frequencies so we’ll draw the linear area of the filter here so no change to the frequency response, and then the nonlinear area there this point here where the linearity
changes is known as the frequency of cut-off or
cut-off point this particular filter rejects this
high frequency material here and there’s a corresponding filter which is similar in it its response entirely except for it is the other way around so the low frequencies are rejected with the nonlinear section but it is still has the same cut-off
point and operates in same way says this this
one rejects this area low-frequency so this filter
is called a low pass filter because the Linea es
in the low-frequency and this one the high-pass filter
crystal in your area in the high frequencies now these two
filters the basic two cartons but they can be combined together to
create for filled types to available in an XT and the first
combination that they can make is two filters overlapping in one direction to produce a filter that lets through unlimited bandwith in the middle
frequency spectrum quietly variable a draw on cutoff
frequency the two fields move up and down to allow you to move that bandpass section either too high or low frequencies
scored a bandpass filter and then if the two filters are slightly apart not overlapping you can create
response which actually rejects a limited bandwidth in the middle sets
this area that’s removed by the filter am and obviously the two fields tied
together and they move up and down according to the cutoff frequency that and this is called not field cuts and not out to the frequency
response now a.m. in all these filters the frequency can be buried up and down that
faye normal characteristic filter Sirleaf frequency cutoff control
can be set but you said you saw that in recent the
other control that you normally find on a filter is the residents control and
what that does is that boosts abound the area of the cut off gives a
slight boost in amplitude just close range of
frequencies and this results in quite a so too a.m. bell-like almost a.m. electronic quality to any sound and that happens at this at these role
of points in all these filter responses okay so
let’s hear what someone that sounds like so if I play back the Luke rooster sound the and then apply a low-pass filter without
residents and mole of the high frequencies eventually
down to nothing South like this the nothing the progressively bringing in the high
frequencies again till full sound his restored and so
it’ll be the residents on it the the and you can clearly hear that
resident sweep going up and down there so if we down switch to high pass filter and under the same thing lately the
residents on so stop with high fences only the says progressively bringing in the lower
frequencies first am closed up and then thats residents often hear bandpass
filter sweep the the and finally a notch fell to sleep to
complete the set the the so they go so obviously I was there controlling the filter frequency cutoff
value their in real time as the and as sound was
playing but a course in your Simon you won’t be
able to do that you went up to see automation system to do that either cuz
that would qualify as a kind of sequencing which is excluded from this Simon so you would
have to resort to modulation envelope or telephone one
both of which have the ability too much late controls of the filter

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