User manual OBERHEIM PROMMER

[. . . ] Oberheim Prommer MIDI Sampler/ PROM programmer USER'S GUIDE Prommer User's Guide 1 Table of Contents Prommer User's Guide 2 Table of Contents Oberheim Prommer User's Guide By Paul J. White Preliminary Edition, June 1986 CAUTION: To prevent fire or shock hazard, do not expose this appliance to rain or moisture. Refer servicing to qualified service personnel. WARNING: This equipment generates and uses radio frequency energy and if not installed and used properly, i. e. , in strict accordance with the instruction manual, may cause harmful interference to radio communications. [. . . ] ENVELOPE DECAY P A R A M E T E R S Press the PARAMETERS button now to set the decay time: DECAY TIME= 3 3 Pressing the PARAMETERS button one more time will display the decay start point: START PT. = 0 / 1 0 0 The number pad and arrows may be used to change the envelope parameters. Press the ENVELOPE button again to go back to the envelope display. The decay of the envelope can be described as a linear decay from the specified start point to the end of the current block. The start point is specified as a fraction of the length of the current block - 0/100 means that the envelope will start at the beginning of the sound, 99/100 means that it will start almost at the end of the sound. A low value for the decay time will give a fast cutoff, and a high value will provide a long gradual envelope. Applying an envelope to a block two or more times increases the effect and makes the decay exponential rather than linear. See Figure 8 for some examples of the effects of envelopes on sounds. HOW TO GET AN ATTACK E N V E L O P E In addition to a decay envelope, you can get the effect of an attack envelope in the following way: First reverse the block, then apply a decay envelope, and then reverse the block a second time. TECHNICAL NOTE ABOUT DECAY TIME For the technically inclined reader, the decay time can be defined as follows; D=decay time, X starts at 255. The current address is set to the start point and is incremented by one until it reaches the end of the block, while the linear equivalent value of the sound data at the current address is multiplied by X/256, and every D bytes, X is decremented by one (until it reaches zero). Prommer User's Guide 39 Sound Modifications PICTURE HERE : Figure 8 - Envelope example Prommer User's Guide 40 Sound Modifications MIXING SOUNDS IN MEMORY The sounds in two blocks may be mixed together into one block. Press the MIX BLOCKS button: 1 MIX WITH 2 * The current block is displayed at the left and the secondary block is shown at the right. You can change the secondary block with the number pad or the arrows. Pressing EXECUTE now will mix the current block with the secondary block at the currently set mix ratio (see below) and store the result in the current block. MIX RATIO The two blocks can be mixed in equal parts, or a different mix ratio may be set. Press PARAMETERS to display the current mixing ratio: MIX RATIO= 3 / 4 Use the number pad or the arrows to change the ratio numerator. The numerator of the fraction (3 in this example) refers to the amount of the CURRENT block to mix and the denominator (4 in this example) refers to the amount of the SECONDARY block to mix. Notice that the denominator always equals four. The numerator may range from zero to sixteen. If you mix two blocks at a mix ratio of 0/4, the secondary block will be copied into the current block at half its original volume level. A mix ratio of 4/4 will mix equal parts of both blocks. RING MODULATION Press the MIX BLOCKS button again until you see the RING MOD. 2 The ring modulate function is like the MIX function except instead of summing two blocks together, the blocks are multiplied together and then scaled down, causing an effect known as Ring Modulation. If you press EXECUTE now, the current block will be multiplied together with the secondary block and the result stored in the current block. [. . . ] A current roster of Authorized Service Centers is included with the Owner's Manual. The Service Center will let you know when the repair can be scheduled, the approximate number of days it will take to complete the repair and if the required parts are in stock or if they need to be ordered. Take the failed unit to the Service Center along with the sales receipt as the Service Center will need to verify the Warranty. If you have returned your Warranty Card, the Warranty Verification Sticker affixed to the bottom panel of your unit is sufficient to prove warranty status. [. . . ]