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-
- CLASSIX1. The music of J. S. Bach arranged
- for the Amiga by ROB BAXTER.
-
- This is the first of what I hope will be many collections of
- fine classical music for the Amiga. I have chosen Bach for
- my first Amiga release for two reasons:
-
- A) I like Bach (what better reason could there be?)
-
- B) Bach's very linear music adapts beautifully to
- this electronic medium.
-
- Bach purists might not approve of my "computer orchestra"
- but there seemed little point in sticking to conventional
- scoring - you can always buy a Bach L.P. if you want that!
-
- The sounds may be new, but the music is pure, note-for-note
- Bach. I have made no attempt to "jazz up" the music, it is
- humbly presented in its new Amiga clothes as written!
-
- About the music:
-
- The BRANDENBURG CONCERTOS were written around 1721 and
- dedicated to Christian Ludwig, Margrave of Brandenburg.
- There are six concertos in total, each one completely
- different in character. Nos. 3 and 4 are presented on this
- disk.
-
- BRANDENBURG CONCERTO NO. 3 in G Major was originally scored
- for three violins, three violas, three 'cellos, double bass
- and harpsichord continuo. Needless to say, my
- instrumentation is nothing like that! The first movement
- swings its relentless way along with an unlikely ensemble of
- strings, glockenspiels and purely "synth-like" sounds -
- although there is a solo violin tucked away in the mix...
- somewhere! In contrast, the third movement gives the brass
- and woodwind sections a chance to shine!
-
- Bach did not provide a true second movement for the third
- Brandenburg concerto, he merely wrote two chords marked
- "Adagio", possibly expecting the performer to improvise his
- own slow movement. With this in mind, I have "invented" a
- slow movement for this concerto based on Bach's "Arioso"
- which leads up to those two final chords.
-
- BRANDENBURG CONCERTO NO. 4 in G Major was scored for solo
- violin, two recorders, strings and harpsichord continuo. In
- my interpretation of this concerto, I have possibly been a
- little more faithful to the master's intentions! Certainly
- in the solo sections I have attempted to reproduce the
- violin and recorder/flute parts called for by the score, but
- in the tutti sections the instrumentation is a little more
- open ended.
-
- PRELUDE AND FUGUE NO. 7 comes from a collection of 48
- keyboard preludes and fugues in two parts (24 each),
- originally entitled "The Well-Tempered Clavier". For obvious
- reasons this compilation is affectionately known as "The
- Forty Eight"! The Prelude presented on this disk is one of
- the most magnificent of all the preludes in the forty-eight
- and is itself divided into three distinct sections. First
- is a stately introductory passage which for this version is
- performed with bright brass and harpsichord tonalities.
- There then follows a beautiful and delicate, almost ethereal
- passage which is carried by soft string tones. The final and
- main section of the prelude is actually a four part fugue
- which in this performance is played by a trio of violins
- backed up by a solid, woody bass line. The prelude finally
- resolves into a glorious, heraldic restatement of its
- opening.
-
- The Fugue proper which follows is light and good humoured
- and in complete contrast to the gravity and majesty of its
- Prelude. I have chosen tonalities which I hope reflect this!
-
- TOCCATA AND FUGUE IN D MINOR is just a little bit famous!
- Bach wrote this organ extravaganza when he was a young man
- and his youthful exuberance spills out in every passage! The
- Toccata in particular is so well known it has almost become
- part of popular folklore! I have presented the Toccata in a
- fairly conventional manner, using very imitative pipe organ
- sounds which work quite well... watch your speakers though!
-
- The Fugue on the other hand is performed by a surreal set of
- instruments which I think complement the traditional organ
- voicings quite well. I often think that the Fugue is more
- exciting than the Toccata, it surges along like a great
- river, almost threatening to burst its banks!
-
- --------------
-
- All the music on this disk was entirely realised in Aegis
- SONIX using instruments created with SYNTHIA. There are no
- sampled instruments or sounds on this disk.
-
- SYNTHIA provides a complete sound synthesis environment on
- the Amiga which is enormously powerful and flexible. Of
- course it has its limitations like any good synthesiser and
- these must be worked around but the ammount of creative
- freedom this package brings to music-making on the Amiga is
- considerable. It means that all my instruments are TRULY my
- own which in turn means that I can at last develop a sound
- and style which is unique to me!
-
- I hope this collection brings a fresh dimension to Amiga
- music.
-
- Enjoy....
-
- --------------
-
- I'm sorry this collection isn't better presented, there
- isn't much room left on the disk for graphics, nor is there
- much space in chip RAM for many instruments as well as
- pretty screens! Roll on the Enhanced Chip Set with a whole
- Meg of chip RAM!!!
-
- There is an option in the main menu for turning the Amiga's
- audio filter back on again. When you boot this disk, the
- filter is disabled (unless you have an A1000, there is no
- way of turning off the filter by software means on that
- machine). All Amigas have this filter to reduce the audible
- effects of foldover, or "aliasing" as it is more commonly
- known. This manifests itself as a high whine on certain
- notes and is a by-product of the way the Amiga produces
- sound. In simple terms, the higher harmonics on some sounds
- try to get themselves reproduced above the so called
- "Nyquist Frequency" and consequently get folded back on
- themselves so that they are echoed, or "aliased" at
- frequencies below the Nyquist. These aliased frequencies
- generally bear no harmonic relationship to the note being
- played so the result to the listener is a slight inharmonic
- whine behind the note being played. Usually though, these
- "rogue" harmonics are low in intensity and tend not to
- distract to a great degree. However, they do irritate some
- listeners, which I suppose is why Commodore Amiga included
- the filter in the Amiga's specification - and which is why I
- have included an option to turn it back on again if you are
- one of these people!
-
- The problem with the filter though, is that whilst
- eliminating most of the aliased frequencies, it makes music
- sound like you're listening through cotton wool. I'd much
- rather enjoy the bright clear tones that the Amiga produces
- with the filter turned off!
-
- What is the Nyquist Frequency? The Amiga treats all sound
- data, be it produced by SYNTHIA, the SONIX "analogue synth"
- or by a hardware sampler in exactly the same way. It treats
- it as a sample! Therefore, regardless of the method of sound
- production there is a master sampling rate. The Nyquist
- Frequency represents the highest frequency that can be
- accurately reproduced by a digital audio system and is
- theoretically the sampling rate divided by two. Therefore,
- with a sampling rate of 10 kHz, the Nyquist frequency would
- be 5 kHz. In practice, the real Nyquist frequency turns out
- to be slightly less than half the sampling rate but here the
- math gets more complex, so I won't attempt to go into it
- mainly because it's largely beyond me!!
-
- The higher the sample rate, the correspondingly higher is
- the Nyquist, but the faster you sample the more memory you
- use up. At present, no matter how much extra RAM you've
- bolted onto your Amiga, all sound data must be confined to
- the first 512k of chip RAM in order for Paula to read it. So
- there is quite a severe trade-off between the sampling rate
- you use and the number of samples that can be held in chip
- RAM at any given time. SONIX and SYNTHIA compromise by
- using a sample rate of around 8 kHz - not "Hi-Fi" by any
- means, but the sound is still astonishingly good!
-
- The Amiga, together with SONIX and SYNTHIA are the answer to
- my prayers!
-
-
- WINGE AND WISH LIST...
-
- The sound capabilities of the Amiga are often overshadowed
- by its more obvious graphics abilities. There is no reason
- why a single "voice" cannot be a multi-note chord, even
- chords made up of different instruments. None of the sound
- editors currently on the market (I include SYNTHIA here)
- offer this facility, nor is it possible with existing
- software to create a glide (with the exception of SONIX).
- Perhaps you know better... or could do better... yourself!
-
- Although the Amiga has a multi-tasking operating system, no
- music editor or player that I'm aware of allows the loading
- of new instruments as the music is playing. This would allow
- for mega-long musical opuses with loads of instruments!
-
- I suppose I can dream.....
-
- ---------------
-
-
- This disk is dedicated to Wendy Carlos.
-
-
- Thanks to PSW
-
-
- ROB BAXTER
- Manchester, U.K.
-
- JULY 1989
-