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Martin D

I'm using GenExpr for the first time, and I have a strange issue.

I have a function with three input parameters that should return the value of input 1 or 2 depending on the value of input 3. Returning the parameter variables directly causes the conditional return to never happen, but it does work if I reassign the inputs to a new variable and return that instead. 

Meaning I am able to get it to work, but I don't understand why this is, so I wanted to post here in case someone knows something or it's a bug. I haven't found anything similar mentioned in docs or other posts. FYI I'm working in Max For Live, but I've had no other issues that I know of. Thanks.

I'm working only in Max For Live so a video was faster. To the right is the value of [out3] of [gen~] in a different window. 

GenExpr - func w/ conditional returns fails to return input variable unless assigned to new variable

genexpr-func-w-conditional-returns-fails-to-return-input-variable-unless-assigned-to-new-variable

Massimiliano Cerioni

I needed to make an accurate latency test of my system, so I took inspiration from the old MSP latency test patch under 

 folder and built an alternative version in gen. There were a couple of active discussions 

, from which I took the threshold trick that Graham implemented.

I needed to make an accurate latency test of my system, so I took inspiration from the old MSP latency test patch under...

a-new-io-latency-test-patch-made-in-gen

A new IO latency test patch made in gen

sonicfusiondesignlab

I have tried the samples from the book called generating sounds and organizing time, however , I cannot find the mix and wrap objects ( probably more but I haven't tried them yet. How can I figure it out ? Thanks !

I have tried the samples from the book called generating sounds and organizing time, however , I cannot find the mix and wrap objects ( probably more but I haven't tried them yet. How can I figure it out ?  Thanks !

Hello 
I have tried the samples from the book called generating sounds and organizing time, however , I cannot find the mix and wrap ... 

about-the-mix-and-wrap-object

( I realized that I write a p patcher instead of gen patcher ) 

About the Mix and Wrap object

A simple implementation of the logistic map equation in gen~. Feel free to share your thoughts.

logistic-map-in-gen~

[history] is still there cause the previous version was a feedback loop, but it can be removed.

Logistic Map in Gen~

Ernest

When assigning polyphonic voices in codebox, additional control and external signal assignments are possible, because the internal pitch/gate/age data arrays and methods are editable. For example, the voice age is accessible for devices such as arpeggiators. Also, the exact manner of voice stealing, voice clear, and voice-count change are directly controllable.

This example patch shows stealing with corrected-least-recently used (CLRU) voice replacement. Upon overflow with a CLRU algorithm, new notes after overflow are less likely to truncate any playing voices that are gated off, but still in any envelope release phase. Internally, three separate pitch, gate, and voice-age arrays are ordered by voice number, and stored in a buffer~ object for external inspection and access.

As with the original poly object, positive integers on the first MIDI-pitch input create a MIDI note-on or note-off event, depending on the second input's MIDI-velocity value.

0 on the first input causes the object to issue GATE-OFF events for any playing voices, then resets the object's internal data.

It has four other enhancements, described below the screenshot

gen2.PNG

the allocator primes the age buffer, empties the others, and sets static variables to default values. VCNT is the maximum number of available voices (edit as desired) and NUMV is the number of active voices (default 0).

Data pch(257), vel(257), age(257);
History numv(0), vcnt(257);
if (in1 <=0){
    ...
    for (i=1; i<=vcnt; i+=1){
        vel.poke(0, i); 
        pch.poke(0, i);
        age.poke(i, i);
        numv = 0;
     }

 gen can only output one event for each input event, so multiple voice-off events for a single reset signal is not possible without enabling the metro . However, enabling the metro also prevents the gen object from receiving more than one input event in any metro interval. 

the allocator first checks to see if all voices are on for overflow handling. Then it increments the age of all voices by one and puts the new note, with age of 1, in the oldest slot. If the note is not found, aoff remains 0 and nothing happens.

if(in2 >0){
    for(i=1;i<=vcnt; i+=1){
        out3 = in2;
        out2 = in1;
        x = age.peek(i);
        if(x==vcnt){
            if(numv==vcnt){
                ...(//kslider fix code)...
                }
            }else{
                numv +=1;
            }
            age.poke(1, i);
            pch.poke(in1,i); 
            vel.poke(in2,i);
            out1 = i;
        }else{
            age.poke(x+1,i);
        }
    }
}

the allocator looks for a note with the same pitch. If found, it sets its age to the current number of voices, decrements numv, and shuffles older notes up in the age queue.

of (in2==0){
    for(i=1;i<=vcnt; i+=1){
        if(pch.peek(i) ==in1){
            aoff = age.peek(i);
            age.poke(numv, i);
            pch.poke(0,i);
            vel.poke(0,i);
            numv -=1;        
            out4 = 0;     //kb fix
            out3 = 0;     //vel 0
            out2 = in1;     //fr off
            out1 = i;    //voice off
        //    break;
        }
    }
    for(i=1;i<=vcnt; i+=1){
        x = age.peek(i);
        if(x>aoff && x<numv){
            age.poke(x+1);
        }
    }
}

Note, when the kslider object receives a note-off message while the user is pressing an on-screen note, it resends the last note-on event. While this could be useful for implementing aftertouch, currently the implementation filters out consecutive note-on events with the same pitch value using a History object called p0 to store the last received pitch:

 History p0;
 ... 
 if (in1 <= 0) {
        ...(reset routines)...  
 } else if (in1 != p0 && in2 >0) {
        ...(voice-on routines)...
        p0 = in1;
} else if (in2 == 0) {
       ..(voice off routines)...
       p0 = 0;
} 

Without the filter on consecutive note-on events with the same pitch, the kslider sets all the output voices to the same pitch while the mouse is clicked and dragged on it. With this filter, the user can click and drag on the kslider object to turn on multiple neighboring notes,. Whenever the voice capacity overflows, the replaced notes are immediately turned off on the kslider object. 

in the first two statements of a note-on event (also there is an mtof() conversion in the reset routine):

    ...     }else if (in1 != p0 && in2 >0) {

out3 = 1 -(in2/127);        //gate out 0-1

        out2 = mtof(in1);         //fc out, Hz

The allocator can contain multiple voices with the same pitch. 

Currently, NOTE-OFF messages turn off all voices with the same pitch. You can change this behavior by uncommenting the BREAK statement at the end of the note-off routine.

...
    }else if (in2 ==0) {
        ...
        // break;
    }

If a voice has already been stolen, note-off messages for are simply discarded.

, this implementation does not add and latency to voice-on events after overflow. If you overflow the voice capacity, then this example may create an audible click on the retriggered voice, which you are free to fix in gen.

When assigning polyphonic voices in codebox,  additional control and external signal  assignments are possible, because the internal pitch/gate/age data arrays and methods are editable. For example, the voice age is accessible for devices such as arpeggiators. Also, the exact manner of voice stealing, voice clear, and voice-count change are directly controllable.  

This example patch shows stealing with corrected-least-recently used (CLRU) voice replacement. Upon overflow with  a CLRU algorithm, new notes after overflow are less likely to truncate any playing voices that are gated off, but still in any envelope release phase.  Internally, three separate pitch, gate, and voice-age arrays are ordered by voice number,  and stored in a buffer~ object for external inspection and access. 

As with the original poly object, positive integers on the first MIDI-pitch input create a MIDI note-on or note-off event, depending on  the second input's MIDI-velocity value.

0 on the first input causes the object to issue GATE-OFF events for any playing voices, then resets the object's internal data.  

It has four other enhancements,  described below the screenshot

 Dynamic voice-count changing. A negative value on the first input sets the number of voices, for example, -64 sets the number of voices  to 64. after reset and GATE-OFF events for any playing voices.  When setting the number of voices with the first input, the  second input is ignored.  Note, if the voice count on other objects is higher, the GATE-OFF events can simply trigger a note-off event on other objects, allowing playing voice amplitudes to decay slowly. However, If lowering the voice count on other objects, some playing voices may click off.  

Direct kslider input: This gen implementation interfaces directly with a kslider object in poly mode. With the kslider object, velocities for note-on  events are 1 at the bottom and 127 at the top of the keyboard.  Therefore the current implementation subtracts velocities in the 1~127 range from 128, also scaling velocity values to 0-1  to gated output amplitude on the third output.  Then the MIDI note frequency (in Hz) is output on the second output, then  finally, the first output sends a voice number for the new voice-on or voice-off event.  Voice-off events are the same as voice-on events, except the third output has a value of 0. 

kslider fix, to turn off notes after voice overflow. On overflow, a fourth output sends the pitch for a MIDI note-off event just prior to the voice-on event, or 0 if there is no overflow. You can pass this value through a "SET $1 0" messagebox to create an input event for the kslider object. 

Connection to mc.gen~ inputs. To send the gen  outputs  to a mc.gen~ object's frequency and gate inputs, the example packs the voice, frequency,  and  gate outputs together, then uses a "SETVALUE $1 $2" message to set a voice's frequency, and a "SETVALUE $1 $3" message to set a voice's gate.  

On reset, the allocator primes the age buffer, empties the others, and sets static variables to default values. VCNT is the maximum number of available voices (edit as desired) and  NUMV is the number of active voices (default 0).   

Data pch(257), vel(257), age(257);
History numv(0), vcnt(257);
if (in1 <=0){
	...
	for (i=1; i<=vcnt; i+=1){
		vel.poke(0, i); 
		pch.poke(0, i);
		age.poke(i, i);
		numv = 0;
 	}

Note, gen  can  only output one event for each input event, so multiple voice-off events for a single reset signal is not possible without enabling the metro . However, enabling the metro also prevents the gen object from receiving more than one input event in any metro interval. 

On note-on events, the allocator first checks to see if all voices are on for overflow handling. Then it increments  the age of all voices by one and puts the new note, with age of 1, in the oldest slot.  If the note is not found, aoff remains 0 and nothing happens. 

if(in2 >0){
	for(i=1;i<=vcnt; i+=1){
		out3 = in2;
		out2 = in1;
		x = age.peek(i);
		if(x==vcnt){
			if(numv==vcnt){
				...(//kslider fix code)...
				}
			}else{
				numv +=1;
			}
			age.poke(1, i);
			pch.poke(in1,i); 
			vel.poke(in2,i);
			out1 = i;
		}else{
			age.poke(x+1,i);
		}
	}
}

On note-off events,  the allocator looks for a note with the same pitch. If found, it sets its age to the current number of voices, decrements numv, and shuffles older notes up in the age queue. 

of (in2==0){
	for(i=1;i<=vcnt; i+=1){
		if(pch.peek(i) ==in1){
			aoff = age.peek(i);
			age.poke(numv, i);
			pch.poke(0,i);
			vel.poke(0,i);
			numv -=1;		
			out4 = 0; 	//kb fix
			out3 = 0; 	//vel 0
			out2 = in1; 	//fr off
			out1 = i;	//voice off
		//	break;
		}
	}
	for(i=1;i<=vcnt; i+=1){
		x = age.peek(i);
		if(x>aoff && x<numv){
			age.poke(x+1);
		}
	}
}

Note, when the kslider object receives a note-off message while the user is pressing an on-screen note,  it resends the last note-on event.  While this could be useful for implementing aftertouch, currently the implementation filters out consecutive note-on events with the same pitch value using a History object called p0 to store the last received pitch:

Without the filter on consecutive note-on events with the same pitch, the kslider sets all the output voices to the same pitch while the mouse is clicked and dragged on it.  With this filter, the user can click and drag on the kslider object to turn on multiple neighboring notes,. Whenever the voice capacity overflows, the replaced notes are immediately turned off on the kslider object. 

You can change the output scaling in the first two statements of a note-on event (also there is an mtof() conversion in the reset routine):

 	... 	}else if (in1 != p0 && in2 >0) {
 		out3 = 1 -(in2/127);		//gate out 0-1
 		out2 = mtof(in1); 		//fc out, Hz
 	... 	} 

The allocator can contain multiple voices with the same pitch. Currently, NOTE-OFF messages turn off all voices with the same  pitch.  You can change this behavior by uncommenting the BREAK statement at the end of the note-off routine. 

...
	}else if (in2 ==0) {
		...
		// break;
	}

Gen Forum