Semita
A Library of Max/MSP Patches for Learning Music Theory

This patch allows you to experience the difference between the linear and logarithmic nature of pitch space. You can use sliders to change the frequency of a sine wave as well as a simple one-octave keyboard. Then, you can see the results on an oscilloscope, spectroscope and on the musical staff.

This basic patch allows a student to pick a note on a piano keyboard. That note is displayed in standard notation on three different staves. The student picking the note gets to see what the note name is (e.g. C4, etc.) Then, another student (or students) in the class identify the note that was chosen. The first student can reveal the correct note name to the class by using their controller.

This is a basic interval quiz. Students can quiz themselves, or work together in a live class setting. Intervals can be shown on treble, alto or bass staves, harmonically or melodically, above or below a give note. A wide range of intervals can be added individually or in groups to the pool. Students can use their wireless devices to control the solutions on the staff in real time. Teachers can input their own students' names, which will be chosen randomly without repeating until everybody on the list is chosen once.

This patch simply allows the user to display a lot of different scales on the staff. Scales include all major and minor scales with key signatures, as well as some of the more typical post-tonal scales (whole-tone, octatonic, etc.)

Similar to the interval quiz, this patch lets you select a pool of scales to be quizzed on. You can choose from three clefs. Students are chosen either one or two at a time. Using tablet controllers or on the patch itself, you can move each note around individually in the scale. Both ascending and descending forms are displayed (even if the scale is the same in both directions). The help system makes each incorrect note red. You can play the scale as many times as you like.

Students can work on spelling triads or any of five types of seventh chords on the staff, in root position or in inversion. They can work in pairs or by themselves to solve the problem. Students can use their wireless devices to change notes in the chord, then check their answer. There are two ways to ask the patch for help. There is also a handy preset system for storing student rosters, and notes are color-coded for easier manipulation.

This patch generates cantus firmi and first species counterpoint in the Ionian mode. The number of notes in the exercise is limited to 9. There are several constraints (e.g. overlap, direct 5ths, three notes in a row, etc.) that can be turned on and off independently. David Lewin's "Global Rule" for counterpoint can also be turned on or off. Students can create good (or bad!) counterpoint, see (and hear!) the results and then discuss the merits or drawbacks of solutions. They can control the constraints on the engine using a wireless controller.

This patch allows you to experiment with some basic transformations on the Tonnetz. You can transform collections of notes in various ways, see the notes on the staff, hear them, and export your work as MIDI. Several improvements are planned for this patch in the near future.

This patch allows you to perform basic P, L and R transformations on a two-dimensional Tonnetz, observe the motion on a graph, hear the triads, and view the notes in staff notation.

After placing notes on a staff, you can analyze their intervals and p[lay the notes back. The patch displays ordered and unordered pitch and pitch-class intervals -- four different kinds of intervals in all. The patch calculates the MIDI notes, the interval vector, and several other useful data.

You can enter integers or note names, and the patch will calculate cardinality, normal form, prime form and interval vector. The patch will tell you if the set is symmetrical. If the PC set has a Z-related pair, it will show you what its Z-relation is. You can transpose and invert your PC set on a circle diagram and on the accompanying staves.

This patch not only makes a twelve-tone matrix from any row you enter (or using one of the presets), but also displays the row on staff notation, analyzes the ordered pitch and pitch-class intervals, shows the prime form of the discrete hexachords, and includes a fun graphic!

If you enter a hexachord, this patch will tell you all the Tn and TnI levels at which that hexachord is combinatorial. It will then show you the twelve-tone rows that the hexachord can generate. There are several useful presets for showing the all-combinatorial hexachord A-F, as well as a few other useful features.

This patch simply generates a random all-interval tone row. It spits rows out one at a time: it would take too long to generate all 1928 different all-interval rows! This patch is based on the help file for the [bach.constraints] object, and so I owe Andrea and Daniele a big thanks for inspiring me.

By controlling parameters such as the frequency of the fundamental, harmonicity, gain for each of the component sine waves, etc., students can experiment with the basic concept of additive synthesis. This is not a synthesizer in the classical sense, but rather just an abstract but visually appealing way to visualize how the technique works.

By controlling several parameters, such as the base frequency, the harmonicity of the bandpass filters, Q, and so on, students can experiment with the basic concepts underlying subtractive synthesis. This is not a synthesizer in the classical sense, but rather just an abstract but visually appealing way to visualize how the technique works.

By specifying pitches on the staff as carriers and/or modulators, you can generate a frequency-modulated series of notes. You can then export the notes as MIDI and view the resultant frequencies. This patch was inspired by some of Tristan Murail's early experiments for his pieces of the 1980s and 1990s. This is not a synthesizer in the classical sense, but rather just an abstract but visually appealing way to visualize how the technique works.

This patch simply allows you to create a Euclidean rhythm E(k,n) with any k or n (as long as k < n). The rhythm is displayed on a circle diagram and in standard notation. The inter-onset-intervals (IOIs) are also displayed. You can export the rhythm in MIDI or XML format and play it.

This patch allows you to create and synchronize up to three Euclidean rhythm cycles at the same time. You can convert the resultant notation to score format and export it as MIDI or XML. The patch uses several step sequencers that are linked together. Each sequencer can be individually controlled using an iPad or other wireless device.

This patch allows the user to generate up to 64 notes of any equal tempered system, defined by the nth root of m. You can specify the frequency (in Hz) of the lowest note as well as the microtonal division. The patch will show you the notes on the staff as well as the frequencies in Hz of every pitch.

While there are as many different ways to generate serial matrices as there are matrices themselves, this patch could provide some introduction to the concept. The patch generates a system of matrices up to six elements long. The first row of each matrix is a rotation of the previous matrix's first row. Integers from each matrix could be used to generate content such as pitch, rate of change, timbre, duration, or any other musical parameter.

This patch allows you to input a number of pitches and choose the order (or depth) of the chain. You can then run the synthesizer to create new material. These notes can then be exported as MIDI or XML. You can also view a type of transition matrix to get an idea of how the patch works.

You can interpolate between four different chords using the mouse. The new chords can be exported as MIDI or XML. This patch was intended to be used as a way to generate micropolyphony, and would function well in that capacity with a little work on the output in a DAW or engraving software.