Update DB to version 17: Machines can have an arbitrary number of sound synthetizers,

so use an interconnection table, `sound_by_machine`.

Cicm.Database/Schemas/SoundSynth.cs

@@ -28,14 +28,34 @@
 // Copyright © 2003-2018 Natalia Portillo
 *******************************************************************************/
 
+using System;
+
 namespace Cicm.Database.Schemas
 {
     /// <summary>Sound synthetizer</summary>
     public class SoundSynth
     {
+        /// <summary>Company</summary>
+        public Company Company;
+        /// <summary>Sample rate in bits of the generate sound</summary>
+        public int Depth;
+        /// <summary>Frequency in Hz of the generated sound</summary>
+        public double Frequency;
         /// <summary>ID</summary>
         public int Id;
+        /// <summary>Datetime of introduction</summary>
+        public DateTime Introduced;
+        /// <summary>Model/SKU code</summary>
+        public string ModelCode;
         /// <summary>Name</summary>
         public string Name;
+        /// <summary>Simultaneous square wave generators</summary>
+        public int SquareWave;
+        /// <summary>Type of sound synthetizer</summary>
+        public int Type;
+        /// <summary>Simultaneous voices that can be generated</summary>
+        public int Voices;
+        /// <summary>Simultaneous white noise generators</summary>
+        public int WhiteNoise;
     }
 }