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9/26/2018
Automations in Karplus-Strong-Con guration
Karplus-Strong is a synthesis technique based on physical modelling of a plucked string: A
short delay and a lter are used to create a resonant loop (simulating the string) that can be
excited with short bursts of noise (simulating the plucking).
Using the ne delay, lter and feedback knob, Thyme can be con gured for Karplus-Strong-
Synthesis allowing separate control over pitch, timbre and decay time.
To facilitate the use as a synthesizer two parameter automations are implemented:
1. When receiving MIDI Note-On messages 9-127 the ne delay knob is set to create a
resonant frequency equal to the frequency de ned by the MIDI note .
2. The decay time in Karplus-Strong con guration is depending both on the delay time and
the amount of feedback. To keep the delay time constant for different MIDI notes, the
feedback is reduced for low notes. This feature can be enabled/disabled by CC89
Realtime Messages
In general, all realtime messages are forwarded like any other message. Depending on the
active clock source they are also generated so that Thyme becomes a MIDI bus master.
No matter which clock source is active, MIDI clock messages are always tracked in the
background. So when switching to MIDI clock source, the sequencer will be set to the position
where it would have been if it was running on MIDI clock all the time.
Active
Behavior
Clock
Source
Tap
Start, Stop and Clock messages are generated according to the Tap Tempo and
the play status of the sequencer.
This only makes sense if there is no other master device up the bus. So as
soon as any realtime message is received, Thyme senses a con ict and stops
generating realtime messages. You can reset this and start sending messages
again by rst selecting a different clock source and then re-selecting Tap.
Received realtime messages are not processed.
Analog
Start and Stop messages are ignored.
Clock
MIDI
Start and Stop messages are used to control the sequencer.
https://bastl-instruments.github.io/thyme/manual.html#/Introduction
Thyme Manual
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