[Stk] Sequencing with the STK

[Stephen Sinclair]

On Sun, Sep 19, 2010 at 10:43 AM, Carlos Viejo
<carlos.viejo.muros at googlemail.com> wrote:
> Hi all,
> i'm developing a system that uses audio generating objects based on the STK
> and openFrameworks to represent these objects visually and let the user
> define their interactions. So far so good, but i'm having trouble creating
> a high resolution sequencer object, that would trigger other nodes. It does
> not need to be very sophisticated, pretty much deliver an accurate tick with
> a given bpm. Any hints? Maybe i'm overlooking something in the STK?

The use of STK is basically to define how each sample of audio is
calculated in an audio callback.  So if you want to make the signal
flow dynamic, the general idea is to allocate STK objects on the heap
using "new", and keep the pointers in some sort of data structure
indicating a signal graph.  You then call their tick() functions and
feed them along to the input of other tick() functions, according to
whatever network of unit generators you want.

How you decide to organize this in terms of a sequencer is up to you,
and probably depends on the class structure of openFrameworks (which
I'm unfamiliar with), so it's hard to answer your question.

As for determining a BPM, you just have to figure out how many samples
per beat to expect (which could be a float if you want to be
accurate), and call the unit generators noteOn() functions or set
their parameters at the appropriate sample tick.  Keep a global tick
count to maintain a clock.

The "crtsine.cpp" example is the best place to start imho.

Steve