#Audulus forum pdf#
#Audulus forum generator#
#Audulus forum Patch#

HereвЂ™s my first take at putting together a Frequency Shifter in Audulus. IвЂ™ve uploaded a few demos to the Audulus Forum. That helped fill in the final pieces of the puzzle, showing how the sine/cosine oscillator (which IвЂ™d already encountered in HordijkвЂ™s Harmonic Oscillator) connects up with the Hilbert filter network (or вЂDome FilterвЂ™ in Moog parlance) to enable the ring modulation and phase cancellations.

#Audulus forum pdf#

Via Don TillmanвЂ™s collection of Moog Patents I could download a PDF of the Bode Frequency Shifter that Moog produced in the early 70s. 4) and a table of frequencies that I could use as a point of departure. Fortunately I also came across an article on Analog Wide Band Audio Phase Shift Networks with a diagram (see fig.

#Audulus forum Patch#

My first searches on the web brought me across HordijkвЂ™s Frequency Shifting patch for the Nord G2 Modular, as well as JГјrgen HaibleвЂ™s descriptions and schematic drawings which filled in a little more detail on the Hilbert transform filter network. However given that ring modulation typically produces multiple frequencies (especially when applied to a complex input signal) a network of filters is needed to cover the entire audible frequency range. If one was only dealing with two (sine) frequencies it would be possible to use a single all-pass filter and adjust the cutoff point accordingly. IвЂ™ve uploaded the patch to the Audulus forum.ДЇurther details on the frequency shifter all-pass filter network: with the gate setting in before the release stage has completed, interesting rhythmic effects can arise.

#Audulus forum generator#

With the attack time set to longer than the clock rate the envelope generator can suddenly starts to function as a kind of clock divider, as Hordijk points out in his NOVARS tutorial video. ItвЂ™s a simple feature that opens up a number of possibilities. This means that a short trigger can result in a long attack swell, or a short attack can be triggered with a broad gate. the attack time of the envelope is independent of the gate time.

In this first small patch IвЂ™ve adapted some of Stephen SchoenвЂ™s uLope modules to include a trigger mode вЂ“ i.e. Hordijk mentions in one of his videos that designing an envelope generator is perhaps the most difficult of all the modules in that there are so many possibilities to consider, and that certainly rings true as IвЂ™ve begun to explore it. IвЂ™ve made a small start on putting together an Audulus version of the Hordijk Dual Envelope generator. The patch can be found on the Audulus forum. Hordijk provides a nice explanation of this technique in one of his NOVARS tutorial videos. Since modulation is most effective when the pitch of the modulating waveform is lower than the one being modulated, a sample & hold has been included. The resulting shapes are perhaps most easily understood by taking a look at the diagrams in HordijkвЂ™s schematic.Д®ach stage also has a modulation input that adds to the values set by the knobs. The second decay is also preceded by a break setting that adjusts how far the first decay falls. With the decay knob turned all the way up, a conventional flat sustain can be achieved. One of the innovations in his design lies in replacing the sustain section with second decay stage that can slowly taper off, thus allowing for more вЂnaturalвЂ™ sounding contours. IвЂ™ve packed the modified uLope sub-stages into a module that more closely resembles the ADBDR envelope in HordijkвЂ™s Dual Envelope generator.