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diff --git a/libs/evoral/evoral/ParameterDescriptor.h b/libs/evoral/evoral/ParameterDescriptor.h
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+/*
+ * Copyright (C) 2014 David Robillard <d@drobilla.net>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef EVORAL_PARAMETER_DESCRIPTOR_HPP
+#define EVORAL_PARAMETER_DESCRIPTOR_HPP
+
+namespace Evoral {
+
+/** Description of the value range of a parameter or control. */
+struct ParameterDescriptor
+{
+	ParameterDescriptor()
+		: normal(0.0)
+		, lower(0.0)
+		, upper(1.0)
+		, toggled(false)
+		, logarithmic(false)
+		, rangesteps (0)
+	{}
+
+	float normal;      ///< Default value
+	float lower;       ///< Minimum value (in Hz, for frequencies)
+	float upper;       ///< Maximum value (in Hz, for frequencies)
+	bool  toggled;     ///< True iff parameter is boolean
+	bool  logarithmic; ///< True for log-scale parameters
+	unsigned int rangesteps; ///< number of steps, [min,max] (inclusive). <= 1 means continuous. == 2 only min, max. For integer controls this is usually (1 + max - min)
+};
+
+} // namespace Evoral
+
+#endif // EVORAL_PARAMETER_DESCRIPTOR_HPP