> Currently there are no alternatives in the current codebase that
> expose this level of instrument/graph building.

There is an open door because csound.h contains `csoundCompileTree',
ORCTOKEN and TREE struct. Perhaps it is useful to simplify the
possible alternatives, otherwise it is only a memo.

  0) mapping for the tokens of `bison' in csound_orc.y

     csound.h:

       typedef enum {
           CS_TOKEN_LABEL,
           CS_TOKEN_OPCODE_NO_OUTPUT,
           CS_TOKEN_OPCODE,
           ...
       } CSOUND_TOKENS;

     Engine/somefile.h:

       const int csound_token[] = {
           LABEL_TOKEN,
           T_OPCODE0,
           T_OPCODE,
           ...
           T_IDENT_I,
           T_IDENT_GI,
           T_IDENT_K,
           T_IDENT_GK,
           ...
       };

     where LABEL_TOKEN, T_OPCODE, etc are the tokens used in csound_orc.y

  1) some utilities (API) to call `make_node' and `make_leaf'
     (csound_orc_semantics.c) with CSOUND_TOKENS. Example:

     PUBLIC TREE* csoundMakeLeaf(CSOUND *csound, int line, int locn, int type, ORCTOKEN *v)
     {
	 if (type < 0 || type >= num_of_tokens)
             type = UNKNOWN_TYPE; /* error handled by the compiler */
                                  /* the alternative is error+exit */

         return make_leaf(csound, line, locn, csound_token[type], v);
     }

     where a possible call is

       csoundMakeLeaf(cs, line, locn, CS_TOKEN_OPCODE, orctoken)

  10) API to call `csp_orc_...'

  11) perhaps other facilities

tito

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