1. 0 The old computing is about what computers can do… the new computing is about what people can do. - Ben Shneiderman

2. 1

3. 2 Motivation programming the passage of time –specifying / controlling –reasoning about time in code –flexible granularity concurrency –parallel –easy to program –precise + granular gain insight about audio programs make audio programming more accessible further enable rapid experimentation

4. 3 Code == Musical instrument

5. 4

6. 5 ChucK Facts text-based, general-purpose programming tailored for real-time audio synthesis and analysis open-source, cross-platform designed from the “ground-up” high-level syntax, low-level control

7. 6 Chistory-1

8. 7 Chistory-2

9. 8 Chistory-3

10. 9 Flexibility, readability trumps performance

11. 10 Core Language Features

12. 11 =>

13. 12 Controlling Time // infinite time loop while( true ) { // set the next sample 1.0 => i.next; // advance time 100::ms +=> now; } Impulse i => dac; demo

14. 13 Advancing Time time stands still until you “advance” it two semantics for advancing time –chuck to now 1::second +=> now; –wait on event event => now; you are responsible for keeping up with time time == sound

15. 14 Concurrency implemented using “shreds” –resemble non-preemptive threads automatically synchronized by time! can work at low and high level

16. 15 “Strongly-timed” what it means: –programs have precise control over their own timing –sample-synchronous control may be asserted at any time for any unit generator transfer primary control over time… –from implicit scheduling to the language –program flow == time flow staying “in the language” –express more from within the language provide natural modularity for on-the-fly programs

17. 16 ChucK Virtual Machine

18. 17 ChucK Virtual Machine Code (“foo.ck”) On-the-fly compiler Process shred Shreduler ChucK Virtual Machine Audio Engine I/O Manager Execution Unit Code (“foo.ck”, “bar.ck”)

19. 18 On-the-fly Programming (running with sonic scissors)

20. 19 (n.) the act of modifying the logic and structure of a program during runtime, for the purpose of rapid experimentation, and exerting expressive control. (also live coding) on-the-fly programming:

21. 20 The League of Automatic Composers (1974)

22. 21 demo

23. 22 The Audicle

24. 23 Hmm-1 Editor Compiler VM Debugger Run-time Develop

25. 24 Hmm-2 Editor Compiler VM Debugger Develop Run-time

26. 25 demo

27. 26 Language Design Solutions make time itself computable –time and duration native types –allow a program to be “self-aware” in time –allow code to schedule itself synchronize concurrency by time or by events –automatically (by time) –manually (using events, also sample-synchronous) hide the mundane, expose true control. do it on-the-fly!

28. 27 http://chuck.cs.princeton.edu/

29. 28 =^