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/usr/include/csound/interlocks.h is in libcsound64-dev 1:6.05~dfsg1-7build1.

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/*
    interlocks.h:

    Copyright (C) 2011 John ffitch

    This file is part of Csound.

    The Csound Library is free software; you can redistribute it
    and/or modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    Csound is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with Csound; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA
*/

// ZAK
#define ZR (0x0001)
#define ZW (0x0002)
#define ZB (0x0003)

// Not used??
#define MO (0x0004)

//Tables
#define TR (0x0008)
#define TW (0x0010)
#define TB (0x0018)

//Channels
#define CR (0x0020)
#define CW (0x0040)
#define CB (0x0060)

//Stack
#define SK (0x0080)

//Printing
#define WR (0x0100)

//Deprecated
#define _QQ (0x8000)